You ship a PSA 10. Two weeks later a return request lands: "item not as described." The box comes back with a slab inside — same card, but it's a PSA 8. Or it's your slab with a crack running down the case edge. Or a case that was opened and snapped back together. The marketplace refunds the buyer. You're out the fees, the shipping, and the gap in value between the slab you sent and the one you got back.
This is the graded-card version of return fraud. It works because the cert number looks like protection. It isn't — not by itself.
How the slab switch works
- The grade swap. The buyer orders your PSA 10 and returns a PSA 8 or 9 of the same card. It's a real slab with a valid cert — just a cheaper one. The refund gap is their profit.
- The cracked slab. The buyer cracks your case, keeps the card, and returns the broken shell — sometimes with a lesser card inside, sometimes empty. A cracked case reads as "damaged in transit" unless you can prove it left your hands intact.
- The resub play. The buyer cracks your high-grade slab and resubmits the raw card, hoping to land the same grade or better under a fresh cert. What you get back is a low-grade slab they bought cheap. Your card re-enters the market wearing a new number.
Why the cert number alone doesn't stop it
A cert number proves a slab exists. It does not prove which slab was in your box.
When a buyer returns a different slab, that slab carries its own perfectly valid cert. Your claim — "this isn't the one I shipped" — becomes your word against theirs, and the item sitting in front of the marketplace agent looks legitimate. The lookup checks out. The grade matches the label. Your word against theirs, with nothing dated on your side.
Cracked cases are worse. The label sits inside the case, so a cracked or reassembled shell can carry your original label with a different card behind it. Unless your listing photos tie a specific, unrepeatable identifier to that specific physical case, you don't have evidence. You have a story.
Marketplaces decide disputes on what's documented. They run their own processes and no seller controls the outcome. What you can control is whether your side of the case is a claim or a dated photograph.
Seal the slab seam
A graded case has one feature that works in your favor: the seam where the two halves of the case meet. That seam is the only way in. Seal across it.
A SLABVANE seal is a 0.75in × 1.77in die-cut holographic vinyl seal, portrait or landscape. Applied across the seam, it sits over the only way into the case. Every seal carries its own random serial — something like K7D-4QM — no two alike, never repeated. Printed into the foil: your brand ghost-watermarked across the surface, serial microtext, an engine-turned rosette, and a fine-line copy-trap raster designed to break up when copied or reprinted.
Be clear about what this is: tamper-revealing, not tamper-proof. A seal cannot physically stop someone from cracking a case. What it does is make the attempt visible. Peeling distorts the foil and shows damage — a lifted seal doesn't go back on clean. And because every serial is unique and never repeated, a replacement seal won't match your records; anything claiming your serial has to survive comparison against your listing photo.
Photograph the seal and the cert together
This is the step that turns a sticker into evidence. In your listing photos, frame one shot where both the seal serial and the cert label are legible together. The marketplace timestamps that photo the moment you list. You now have a dated record: this slab, this cert, this serial, sealed, on this date — created before the buyer ever existed.
Then say it in the listing:
This slab ships with a serialized security seal across the case seam, photographed in this listing. Returns are accepted with the seal still applied and intact.
Log the serial in your own records — a spreadsheet next to the order number is enough.
The return comparison ritual
When a return arrives, don't just open the box. Run the same check every time:
- Film the opening. One continuous shot from shipping label to contents. Thirty seconds of phone video.
- Find the seal. Missing entirely is itself a finding — your listing photo shows it was there.
- Check its condition. A peeled-and-reapplied seal shows distorted foil and damage. For a suspected reproduction, compare the microtext, the rosette, and the copy-trap raster against your listing photo — fine-line detail like that is designed to degrade when copied.
- Compare the serial. Against your records and your listing photo, character by character.
- Compare the cert. The cert in the return should match the cert photographed next to your seal.
Your protection triggers when the seal comes back removed, tampered, or missing. Any of the three, and your dispute file writes itself: the dated listing photo of seal plus cert, the serial log, and the unboxing video showing what actually came back.
What this does and doesn't do
No seal guarantees you win a dispute. eBay, Whatnot, and TCGplayer decide their own cases. What changes is the quality of your file: instead of word-against-word, you're submitting specific, dated, photographic evidence that the returned item fails a documented comparison.
The second effect is quieter. Slab switchers pick soft targets. A listing that shows a serialized seal and states the return condition tells them, before they buy, that this order will be checked. That's the deterrent: this seller documents.
The math is not close. One switched slab can cost four figures on a single order. A pack of 12 seals is $8.99 — under seventy-five cents per slab shipped.
Set it up before the next return
Design your seal in the builder — designer art, your own logo, or full custom artwork, with an optional QR that points at any link you choose. Case breakers and volume sellers can order serialized runs of 100–1,000 with sequential numbering under your own prefix, from $79. For the full playbook across raw cards, breaks, and shipped singles, see the return fraud guide.