Oct 15, 2026Sourcing Guides
FBA Prep: What Amazon Actually Rejects in an Inbound Shipment
A rejected inbound shipment is rarely bad luck. Barcode, bag, carton, count: the interception order we run at the prep bench, and why the fix goes back to the factory.
A rejected inbound shipment is rarely bad luck. Most of the risk is packed in before the container leaves China: a barcode hidden under a supplier label, a polybag that will not pass check-in, a carton whose marks do not match the plan. What follows is the order in which our prep bench catches these problems, and why the fix goes back to the factory.
Most Rejections Are Decided Before the Container Leaves China
We run fulfillment for Amazon sellers out of China, across three models: bulk stocking, FBA prep before the shipment moves, and on-demand dispatch. The middle model is where this guide lives. The logic is simple. A batch fixed in Shenzhen is a work order. The same batch flagged abroad is an incident: rework, extra handling, and a seller paying twice for one mistake. Amazon's inbound requirements change over time, and the live wording sits in Seller Central; what we can show you is where shipments physically go wrong.
That is why the checks below run before the container, not after a rejection. Inspection depth is a different line of work, and it lives in our FBA inspection playbook (/knowledge-hub/amazon-fba-qc-inspection-shenzhen-dongguan). This one stays at the prep bench.
Barcodes First: One Scannable Label, Nothing Else Visible
The first scan is where shipments get flagged. If a unit carries two barcodes, the scanner reads the wrong one often enough to matter, and the shipment stops being about your product and becomes about your labels. At our bench, every unit leaves with one scannable mark and nothing else visible. FNSKU stickers go on, supplier barcodes get covered or removed, because "probably fine under the sticker" is not a plan.
We print thermal labels in house and test each batch with a real scan gun, the kind the check-in line uses. Placement gets the same treatment: flat where the unit allows it, clear of seams, creases and curves. The cost of this step is small. The cost of skipping it is a flagged shipment, and those are expensive at any size.
Polybags and Warnings: Where Supplier Specs Die
Supplier specs say "packed in polybag" and stop there. The check-in table does not stop there. We open the bag and check it the way an inbound crew will: sealed around the unit, no loose opening hanging off a corner, and the warning printed where a person can read it without opening anything. The usual failure is not the bag itself. It is the assumption that any bag from an old run still counts.
Bag materials, seal quality and warning placement drift between supplier batches. One bad run inside a good one turns the whole carton into a flagged carton, which is why we re-bag in house when the film or the print is wrong, instead of arguing about the spec sheet. The unit ships the way the check-in line expects to see it. That is the whole point of prep.
Cartons and Marks: The Box Is Part of the Product
The carton has two jobs. It protects the unit, and it tells the warehouse what is inside without opening anything. Marks go on straight and readable, and they match the plan for that shipment. A wrong mark is a problem someone else discovers. We check corners and edges before anything closes, because a crushed corner is the first thing a buyer photographs, and damp or soft board turns into a claim nobody wants to file.
When several suppliers feed one shipment, cartons arrive at different times in different conditions. Making them one consignment with one set of marks is part of the job, and so is volume: we compress and re-pack where we can, because a carton that is half air is a carton you handle twice. The box is not packaging around the product. It is the last quality gate the product passes.
Counts and Specs: The Silent Rejection
Barcode problems announce themselves. Counts do not. A short carton looks exactly like a full one until someone counts it, and by then it sits an ocean away from the supplier who packed it. That is why every incoming piece gets checked, not a sample: the box comes off the truck, comes open, and every unit inside is checked against the order.
The bench runs twice a day, morning and afternoon, and a purchase order moves through in 8 to 10 hours on average. Wrong model, wrong color, two SKUs mixed in one carton: none of it survives that process. The sample stage catches problems even earlier. A beauty pillow inquiry we handled put two samples side by side: one with ordinary cotton laced with dark, hard fibers and a sharp smell, the other with down cotton, even and springy. The choice was clear. Steady lines suit this rhythm best: a pet soft chew line we handle comes back month after month with steady volumes.
When We Catch One, It Goes Back to the Factory
What a bench catches is not always what a bench can fix. A crooked label on an odd-shaped unit, a warning print too faint to read in daylight: we rework those here, then check again. But when the problem is upstream, the defect comes out of stock and does not go back in until the factory has replaced it. Short shipments get recounted and replaced at the source. A carton that fails its corner check gets rebuilt, not taped and hoped over.
Some fixes stay here; the rest go upstream. This is the practical difference between prep in China and prep abroad. Here, the fix runs uphill to the people who made the mistake, while the shipment is still inside their reach. Overseas, the same fix means a foreign warehouse improvising on your invoice. We would rather spend the week before loading than the month after it.
Prep Before You Ship: Send Us One SKU
Give us one SKU and the inbound plan behind it, through our contact page (/contact-us). You get back a prep scope for that product and a rate card, covering labels, bags, cartons and counts, so you know what the bench will do before anything is booked. We run prep out of Shenzhen, Dongguan, Yiwu and Nanning, with order processing inside 12 hours. The full service side, warehousing, prep and multi-channel dispatch, sits on our fulfillment page (/b2c-fulfillment). Contracts and company payments are handled by Dore Technology Co., Ltd. A boring prep bench is a working prep bench. That is the goal.
