How to Spot a Fake Graded Slab

A graded slab is supposed to be the end of the argument. The card is authenticated, graded, sealed in tamper-evident plastic by a trusted grader — case closed.

Except the slab itself has become the target. As graded cards and comics have climbed in value, counterfeiters have moved on from faking the card to faking, swapping, and re-using the holder around it. The label looks right, the case looks right, and the item inside may not be what the label says.

The five ways a graded slab gets faked

These are the fraud vectors collectors and dealers run into most often. Described here in general terms, so you know what you're looking at as a buyer.

1. 01Forged label — a fake grading label carrying a real-looking cert number, placed inside a counterfeit or genuine-style holder.
2. 02Counterfeit holder — a replica of a grader's slab, sometimes convincing enough to pass a quick look in a case, a photo, or a live stream.
3. 03Crack-and-regrade — a card removed from its holder, then altered or swapped and resubmitted or reholdered so it carries a grade it shouldn't.
4. 04Reholder swap — a genuine slab opened and a different, lesser, or counterfeit item sealed back into a real holder. This is the hardest to catch, because both the holder and the label are authentic.
5. 05Altered-then-graded — a card doctored (trimmed, recolored, restored) before submission in an attempt to earn a higher grade than it deserves.

What collectors check today (and where it falls short)

Careful buyers already run a sequence of checks. All of them are worth doing. None of them is complete, and it's worth being honest about where each one stops.

Cert number lookup

Pull up the grader's online database and confirm the card, the grade, and the images match the slab in front of you. Limit: a swapped item can still sit behind a valid cert. The database describes what was graded, not what is inside the holder now.

Label details

Compare font, alignment, hologram, and print quality against a known-genuine example. Limit: good forgeries pass this, and a genuine reholdered slab passes it perfectly — the label really is real.

Holder integrity

Look for reseal seams, glue residue, off dimensions, or a case that has been opened and rejoined. Limit: skilled reholdering leaves very little trace, especially in photos.

The card itself

Check centering, surface, edges, and corners against the assigned grade, and look for signs of trimming or restoration. Limit: this requires real expertise, and sophisticated alterations are difficult to see through plastic.

Weight and feel

Compare the slab against a known-genuine one from the same grader and era. Limit: suggestive, never conclusive.

“Every one of these checks inspects the slab as it appears right now. None of them independently ties the specific item in the holder to a verified point in time — and none of them reliably survives a professional reholder swap.”

Why the cert number isn't enough

A cert number proves that a graded item with that number exists in the grader's records. It does not prove that the item currently sealed in the holder is that item.

Once a holder can be opened and resealed, the cert and the physical item can drift apart. The label keeps pointing to a real record while the contents have changed — and the record has no way to know.

The question a buyer actually wants answered isn't "does this cert exist?" It's "is the item in THIS holder the one that was graded, and has this holder been opened since?"

How SlabProof™ closes the gap: unit-level provenance

SlabProof works at the level of the individual slab rather than the certificate record. The mechanism is deliberately simple.

• —A tamper-evident NFC seal (NXP NTAG 424 DNA) is applied to the individual slab. Tapping it with a phone opens that slab's provenance record.
• —Because the seal is tamper-evident, opening the holder becomes a visible, recorded event — the record shows whether the slab has been opened since it was sealed.
• —SlabProof shows an attestation level, so a buyer knows exactly what was verified: a registry record (owner-attested), an owner- or dealer-applied seal (tamper-evident from the date it was applied), or an event-verified record where SlabProof staff visually inspect the item before sealing — the highest trust signal.
• —Verification needs no app and no account. A buyer taps or scans and the slab's record opens in a browser.

Put simply: the cert number tells you a grade was once assigned. The provenance seal tells you whether this exact holder has been opened since it was sealed, and who stands behind that seal.

A practical checklist for buyers

1. 01Look up the cert number in the grader's database and confirm the card, grade, and images match.
2. 02Inspect the label — font, alignment, hologram, print quality — against a known-genuine example.
3. 03Examine the holder for reseal seams, glue, or off dimensions.
4. 04Study the card against its assigned grade for signs of trimming, restoration, or a swap.
5. 05Buy from reputable sellers, and treat suspiciously cheap "too good to be true" slabs with caution.
6. 06If the slab carries a SlabProof seal, tap it — confirm it hasn't been opened since sealing, and check the attestation level and who verified it.