Unknown seller monitoring
Know when an unfamiliar seller appears on your Amazon listing.
Monitor seller changes around protected ASINs, compare new observations with your authorized seller records, and investigate potential hijacker-risk signals from one workspace.
Already dealing with an unfamiliar seller? Get Expert Help →
Portable Blender
ASIN B0XXXXXXX
Sellers
- Your Brand Store✓ Authorized
- Distributor A✓ Authorized
- XYZ StoreNew
New seller observed · XYZ Store
- First seen
- 10:42 AM
- Price
- $27.99
- Buy Box
- Changed
- Status
- Needs review
Fictional product, sellers and values.
- 4
- Expert services
- from $299
- Starting price
- 3
- Subscription plans
- up to 250
- Monitored listings per plan
An unfamiliar seller is a signal to investigate — not proof of hijacking, counterfeiting or wrongdoing.
- Seller changes
- Authorized sellers
- Buy Box context
- Price context
- Evidence
- Alerts
- Cases
Seller monitoring is in development.
This page explains how Hijacker Alerts is designed to work. Scheduled seller checks, authorized-seller lists and seller alerts aren't available to customers yet, and every panel below is a sample. Market data lookups and Expert Services for seller issues are available today.
Education
What sellers usually mean by listing hijacking
"Hijacking" isn't a formal Amazon term. Sellers use it for several different situations, and treating them as the same leads to wasted effort, or to accusations that can't be supported. It helps to separate what you observed from what you suspect.
- Another seller offering the same product
- Often legitimate. Resellers of genuine stock can list on existing ASINs under Amazon's rules.
- Potential unauthorized seller
- A seller outside your distribution network. Whether that breaks an agreement or policy depends on the facts.
- Potential counterfeit concern
- A reason to suspect the goods may not be genuine. It needs evidence, such as a test buy, to confirm.
- Listing content changes
- Edits to title, images, brand or other fields. These can come from any contributor, not only a new seller.
- Buy Box competition
- Sellers competing on price, stock and performance. Losing the Buy Box is often ordinary competition.
- Potential listing-hijacking behavior
- A combination of signals — for example a different product sold under your ASIN — that justifies investigation.
Careful language
Unknown seller, potential risk and confirmed wrongdoing are different things.
Unknown seller
A seller AmzEngine has observed that isn't currently in your authorized or known seller records.
Potential hijacker risk
A collection of available signals that may justify further investigation.
Confirmed wrongdoing
Requires sufficient evidence and an appropriate external determination — for example by Amazon. AmzEngine doesn't make this determination.
How monitoring works
From seller observation to investigation.
Each check records the sellers the data source returns for a protected ASIN, compares them with the previous check and with your known sellers, and only raises an alert when something new needs your attention.
- 1Protected ASIN
- 2Sellers observed
- 3Compare with previous state
- 4Check authorized sellers
- 5New seller found
- 6Create alert
- 7Investigate
- 8Resolve or get expert help
See when the seller landscape changes.
Comparing two checks side by side shows exactly what changed. Seller coverage depends on the marketplace and data source; AmzEngine records only sellers the source returns.
Seller count: 2
- Brand StoreAuthorized
- Distributor AAuthorized
Seller count: 3
- Brand StoreAuthorized
- Distributor AAuthorized
- XYZ StoreNew observation
Detected 10:42 AM
Authorized sellers
Keep known sellers separate from sellers that need review.
List the sellers you know — your own storefront, distributors, approved retailers. Any seller not on the list is shown as unknown, and you choose what happens next.
Authorized status is your own classification. AmzEngine doesn't verify it or check it against Amazon, and it isn't evidence that any other seller is unauthorized.
Not yet available: customer tools for managing authorized sellers are still being built.
| Seller | Seller ID | Products | Status |
|---|---|---|---|
| Brand Store | A1XXXXXXXX | 28 | Authorized |
| Distributor A | A2XXXXXXXX | 14 | Authorized |
| XYZ Store | A3XXXXXXXX | 1 | Unknown |
Risk signals
Investigate the surrounding signals.
One observation rarely tells the whole story. Looking at what else happened around the same time helps you decide what deserves attention first — and what is probably ordinary competition.
- Newly observed seller
- Significant observed price difference
- Buy Box status changed
- Listing content changed
- Seller repeatedly appears
- Test-buy or evidence you supply
- Unexpected offer activity
AmzEngine shows a plain review level — Low, Moderate or Needs review — and the signals behind it. There's no hidden numeric score, and the level is never a finding of wrongdoing.
Potential hijacker risk
● Needs reviewSignals: 3
- New sellerDetected
- Price differenceObserved
- Buy Box changeDetected
- Listing changeNone
Review pricing around the seller observation.
- Your offer
- $34.99
- New seller
- $27.99
- Difference
- −$7.00
Detected 10:42 AM
Price differences are useful context, but they don't prove counterfeit or unauthorized activity. Sellers discount for many ordinary reasons.
Connect seller observations with Buy Box history.
- 10:42New seller observed
- 11:17Buy Box lost
- 12:05Price changed
- 18:08Buy Box recovered
Timing does not establish causation.
Explore Buy Box MonitoringSee whether listing content changed around the same period.
- Title
- No change
- Images
- Changed
- Brand
- No change
- Price
- Changed
- Seller count
- 2 → 3
- Buy Box
- Owned → Lost
Alerts
Get notified when a new seller needs review.
Seller alerts use the same notification system as the rest of AmzEngine. A rule sets the condition, severity, channels and a cooldown so an unchanged situation doesn't keep sending the same message.
Unknown seller detected
- Product
- Portable Blender
- ASIN
- B0XXXXXXX
- Seller
- XYZ Store
- Observed price
- $27.99
- Detected
- 10:42 AM
When
New seller observed
And
Seller is not on your authorized seller list
- Severity
- Warning
- Cooldown
- 6 hours
- Channels
- Email, Telegram
- Notify
- Members with alerts on
Alerts without unnecessary repetition
- 10:42Unknown seller detected
- —No repeat alert while nothing changes
- 18:15Seller no longer observed
Duplicate alerts are suppressed and cooldowns respected by the shared notification system. Seller-specific rules aren't live yet.
Channels
- In-app
Where enabled for your workspace:
- SMS
- Telegram
Not yet available: seller alerts start once scheduled seller checks run for your listings.
Investigation
Move from alert to investigation.
Opening an alert brings the facts together: when the seller was first and last seen, the observed price, Buy Box and listing events, and the evidence you've added — so you can decide calmly.
Keep the evidence around the issue organized.
- Marketplace seller observations
- Price observations
- Buy Box history
- Listing-change history
- Screenshots
- Seller IDs and storefront references
- Brand documentation
- Invoices, where appropriately supplied
- Test-buy evidence, where appropriately obtained
- Your notes
- Support correspondence
AmzEngine never generates evidence. It only stores what was observed or what you add.
Not yet available: the investigation workspace and evidence storage are still being built.
Unknown seller
- Product
- Portable Blender
- ASIN
- B0XXXXXXX
- Seller
- XYZ Store
- First seen
- 10:42 AM
- Last seen
- 4:18 PM
- Observed price
- $27.99
- Buy Box events
- 2
- Listing changes
- 1
- Evidence
- 3 items
Seller observation
- Source
- Marketplace data
- Observed
- Sep 27, 10:42 AM
- Freshness
- Historical record
Every record keeps its source and time, so system observations stay distinct from files you upload.
Potential counterfeit concern
Counterfeit concerns require evidence, not assumptions.
Signals can justify a closer look, but they can't confirm that goods are fake. Confirmation usually means a test buy, physical inspection or Amazon's own investigation. AmzEngine uses the label "potential counterfeit concern" and never "potential counterfeit concern".
See how Brand Protection organizes brand-risk signals- Low price ≠ counterfeit
- Unknown seller ≠ counterfeit
- Buy Box loss ≠ counterfeit
Checklist
An unfamiliar seller appeared. What should you review?
- 1Confirm the seller's identity and storefront.
- 2Review your authorized seller records.
- 3Review the observed price.
- 4Check Buy Box history.
- 5Review recent listing changes.
- 6Preserve screenshots and evidence.
- 7Review brand or trademark documentation where relevant.
- 8Consider a legitimate test buy or other evidence steps where appropriate.
- 9Use Amazon's reporting and support processes where appropriate.
- 10Seek qualified expert or legal help when required.
What to avoid
- Accusing a seller of counterfeiting without evidence
- Fabricating invoices or other evidence
- Submitting complaints you know are false
- Assuming every reseller is unauthorized
- Repeatedly filing unsupported reports
- Contacting or pressuring sellers improperly
General operational guidance, not legal advice.
From alert to expert assistance
Need help investigating the seller?
Some seller issues need a person: reviewing the evidence, deciding whether and how to report, and preparing a clear submission. Expert Services are available today.
- 1Unknown seller alert
- 2Investigate
- 3Review evidence
- 4Get expert help
- 5Hijacker assistance
- 6Service order
- 7Expert case
- 8Documents, messages, status
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Results can't be guaranteed. Amazon makes final enforcement decisions.
AmzEngine monitoring (software)
- Observes seller changes
- Creates alerts
- Stores history
- Organizes evidence
- Supports investigation
Expert Services (people)
- Human case review
- Evidence review
- Strategy
- Document preparation where applicable
- Follow-up guidance
Data freshness
Know when sellers were last checked.
AmzEngine doesn't claim regular checks. Once seller checks are available, how often a listing is checked will depend on your plan, the marketplace and data-source limits — and every result will show when it was last checked.
- Last checked
- 12 min ago
- Status
- Fresh
- Next check
- Scheduled
Marketplace coverage: Amazon US.
Monitor seller activity across protected listings.
| Product | ASIN | Known | Unknown | Buy Box | Last checked | Alerts |
|---|---|---|---|---|---|---|
| Portable Blender | B0XXXXXXX1 | 2 | 1 | Lost | 12 min ago | 1 |
| Travel Mug | B0XXXXXXX2 | 3 | 0 | Owned | 40 min ago | 0 |
| Blender Jar | B0XXXXXXX3 | 1 | 0 | Owned | 2 h ago | 0 |
One seller alert often leads to a wider question. Listing Protection tracks the listing itself, and Brand Protection brings sellers, listings and evidence together across a brand. For account-level issues, see Account Health.
Who it's for
Practical for anyone who sells their own products on Amazon.
Private label sellers
Notice unfamiliar offers on products you created and decide quickly whether they matter.
Brand owners
Keep a record of who sells your products, alongside price and Buy Box context.
Agencies
Help clients sort ordinary competition from issues worth escalating.
Multi-brand operators
Planned: review seller activity across many listings in one table.
How it works
- 1
Add or select a listing
- 2
Set your known and authorized sellers
- 3
Turn on seller monitoring
- 4
Receive seller-change alerts
- 5
Investigate or request expert help
FAQ
Hijacker alert questions
What is Amazon listing hijacking?
Sellers usually use "hijacking" to describe another seller offering on their listing in a way that may not be legitimate — for example selling a different or counterfeit product under the same ASIN, or changing listing content without permission. It isn't a formal Amazon term, and many situations that look like hijacking turn out to be ordinary competition.
What is an unknown seller?
A seller AmzEngine has observed on your listing who isn't on your known or authorized seller list. It's an observation, not a judgement — the seller may be a retailer you've forgotten, a reseller of genuine stock, or someone who needs a closer look.
Does another seller automatically mean my listing is hijacked?
No. Other sellers can often legitimately offer the same product. Whether an offer is a problem depends on facts such as where the goods came from, your distribution agreements and Amazon's policies — things only an investigation can establish.
Can AmzEngine detect a new seller?
AmzEngine's market data lookups return the offers and Buy Box seller available for an ASIN, where the data source provides them. Scheduled seller checks that compare each result with the previous one and alert you aren't available to customers yet.
Can AmzEngine tell whether a product is counterfeit?
No. Counterfeits can't be confirmed from marketplace data. AmzEngine can bring together signals such as a new seller or an unusually low price, but confirming a counterfeit normally needs a test buy, product inspection or Amazon's own process.
What happens after a seller is detected?
The seller is shown with when it was first seen, its observed price and any Buy Box or listing events around the same time. You then decide: mark it as known, keep watching, investigate, or ask our specialists for help.
Can I mark a seller as authorized?
Yes, that's how the authorized seller list is designed to work: you decide which sellers are known to you. The list is your own record — AmzEngine doesn't verify it. Customer tools for managing it aren't available yet.
Can I monitor Buy Box changes too?
Buy Box monitoring is covered on its own page. Seller observations and Buy Box events are designed to appear on the same timeline, because seeing them together helps you ask better questions.
How often does AmzEngine check sellers?
AmzEngine doesn't promise real-time checks. Once seller checks are available, how often a listing is checked will depend on your plan, the marketplace and data-source limits, and every result shows when it was last checked.
Can I monitor multiple ASINs?
The workspace is designed to show seller activity across several protected listings in one table. Protected-listing monitoring isn't available to customers yet.
Does AmzEngine automatically remove sellers?
No. AmzEngine doesn't file reports, contact sellers or remove offers. Only Amazon can take enforcement action, and you decide whether and how to report an issue.
What if I need help investigating or removing a seller?
Our Hijacker Removal & Prevention service is available today. A specialist reviews the facts, helps you gather evidence and prepare a response through the appropriate Amazon channels. Results can't be guaranteed — Amazon makes the final decision.
AmzEngine is an independent software and service provider and is not affiliated with or endorsed by Amazon.
Know when the seller landscape changes.
Monitor seller observations, review surrounding Buy Box and price signals, and investigate potential issues with AmzEngine.
Already have a seller issue? Get Expert Help →