What is an LPN Number on Amazon? A Complete Guide
An LPN (License Plate Number) is a temporary barcode that Amazon assigns to individual units inside its fulfillment centers to track inventory — especially during the returns process. Unlike ASINs or FNSKUs, LPN numbers aren’t tied to your product listing. They’re Amazon’s internal tracking tool, and sellers most commonly encounter them as stickers on returned items. At Marketplace Valet, we process thousands of FBA returns across our client accounts every month, and understanding LPN numbers is essential to recovering inventory value and catching discrepancies early.
What Does LPN Stand For on Amazon?
LPN stands for License Plate Number. It’s a unique identifier — typically a barcode starting with “LP” followed by a string of digits — that Amazon assigns to a single unit of inventory. Amazon’s warehouse systems use LPN numbers to:
- Track individual units as they move through fulfillment centers
- Process and sort customer returns
- Identify specific items during restocking, repackaging, or disposal
- Prevent inventory mix-ups when multiple sellers offer the same product
Think of it like a license plate on a car — it’s not about what model the car is, but which specific vehicle you’re looking at. That’s what an LPN does for a single unit in Amazon’s warehouse.
Where Will You Find LPN Numbers?
You’ll encounter LPN numbers in three main situations:
On returned products. When a customer returns an item to Amazon, the fulfillment center slaps an LPN sticker on it during intake. If you request a removal order and have those units shipped back to you, you’ll often see these stickers on the packaging or directly on the product.
In Seller Central inventory reports. Amazon’s FBA inventory reports can reference LPN numbers for units that have been through the returns pipeline. This is particularly useful when reconciling returned inventory against refund reports.
During inventory inspections. If you work with a 3PL partner (like us) that receives and inspects your FBA removals, LPN stickers are one of the first things we check — they tell us the unit went through Amazon’s returns system and needs a condition assessment before relisting.
How Is an LPN Different from an ASIN, FNSKU, or UPC?
Amazon uses multiple identifiers and they each serve a different purpose. Here’s how they compare:
| Identifier | What It Identifies | Permanent? | Example |
|---|---|---|---|
| ASIN | A product listing in Amazon’s catalog | Yes | B07XYZ1234 |
| FNSKU | A seller’s specific inventory within FBA | Yes | X000ABCD12 |
| UPC/EAN | A product universally (manufacturer-assigned) | Yes | 0123456789012 |
| LPN | A single physical unit inside Amazon’s warehouse | No — temporary | LP123456789012 |
The critical distinction: ASINs, FNSKUs, and UPCs are permanent identifiers tied to product listings. An LPN is temporary — it’s assigned to one physical unit for internal tracking and has no meaning outside Amazon’s fulfillment network.
Why Do LPN Numbers Matter for Amazon Sellers?
If you’re running FBA at any scale, LPN numbers intersect with your business in a few important ways:
Returns accountability. The LPN connects a specific returned unit to the customer’s return. When you’re investigating whether Amazon correctly assessed a return’s condition (sellable vs. unfulfillable), the LPN is your paper trail. In our experience managing returns for 8-figure Amazon brands, having this identifier makes it far easier to file reimbursement claims when Amazon miscategorizes a return.
Inventory accuracy. LPN numbers help you reconcile what Amazon says is in your inventory versus what’s actually there. If units go missing or get stuck in “reserved” status, the LPN trail can help Seller Support locate them.
Resale readiness. A returned unit with an LPN sticker needs processing before it can be resold. The sticker needs to come off, the product needs inspection, and a valid FNSKU label needs to go back on. Skipping this step can create fulfillment errors or stranded inventory.
How to Handle Products with LPN Stickers
When you receive returned inventory with LPN numbers — whether at your own facility or through a 3PL — here’s the process we recommend based on handling returns across dozens of seller accounts:
1. Inspect the product condition. Don’t assume Amazon’s condition grading is accurate. We regularly find items marked “customer damaged” that are actually in perfect, sellable condition — and vice versa. Open the packaging, check the product, and make your own assessment.
2. Remove the LPN sticker. The LPN barcode will interfere with scanning if the item re-enters FBA. Peel it off carefully — some adhesives can damage packaging. Replace it with a fresh FNSKU label.
3. Cross-reference with your returns report. Pull the FBA Customer Returns report in Seller Central and match the unit against the return reason and refund amount. This is where you catch discrepancies — items refunded as “defective” that are clearly unused, for example.
4. Decide: relist, liquidate, or dispose. If the item passes inspection, relabel it and send it back to FBA. If the packaging is damaged but the product is fine, consider selling it as “Used — Like New” or through Amazon’s liquidation program. Only dispose of genuinely unsellable items.
5. File reimbursement claims when warranted. If Amazon refunded the customer but the return never arrived at the fulfillment center — or arrived in a different condition than reported — you may be owed a reimbursement. The LPN number helps Seller Support trace the unit.
Real Example: Recovering $12K in Lost Inventory
One of our clients — a private-label seller doing roughly $3M/year on Amazon — noticed their unfulfillable inventory was growing steadily while their return rate stayed flat. When we audited their FBA removals, we found dozens of returned units with LPN stickers that Amazon had classified as “defective” but were actually in perfect sellable condition.
We removed the LPN stickers, relabeled everything with FNSKUs, inspected each unit, and sent the sellable inventory back to FBA. For units that had been incorrectly disposed of by Amazon, we filed reimbursement claims using the LPN trail. Total recovered value: just over $12,000 in a single quarter.
This is a common scenario — and it’s one reason we tell every seller to request removal orders for unfulfillable inventory rather than letting Amazon auto-dispose of it.
Frequently Asked Questions
Can I use an LPN number to track a product outside of Amazon?
No. LPN numbers are internal to Amazon’s fulfillment network. They have no meaning or scannable value outside of Amazon’s warehouse systems. Once a unit leaves the fulfillment center, the LPN is effectively retired.
Are LPN numbers permanent?
No — LPN numbers are temporary. They’re assigned when a unit needs internal tracking (typically during returns processing) and don’t persist as a permanent identifier like an ASIN or FNSKU.
What should I do if I receive a returned product with an LPN sticker?
Inspect it for damage, remove the LPN sticker, apply a valid FNSKU label, and cross-reference the unit with your FBA Customer Returns report. If it’s in sellable condition, send it back to FBA. If it’s been incorrectly classified, file a reimbursement claim.
Do all Amazon FBA products get LPN numbers?
Not all. LPN numbers are primarily assigned to units going through returns processing or requiring special handling. Your standard inbound inventory that ships and sells without issue won’t typically have an LPN assigned.
Can an LPN sticker cause problems if I send the item back to FBA?
Yes. If the LPN barcode is still on the unit when it arrives at the fulfillment center, it can cause scanning conflicts. Always remove LPN stickers and apply a fresh FNSKU label before sending inventory back to Amazon.
How do I find LPN information in Seller Central?
Check the FBA Customer Returns report (under Reports → Fulfillment → Customer Concessions) and the Manage FBA Inventory page. LPN data also shows up in removal order reports if you request units back from Amazon’s warehouses.