How to spot a fake graded slab

A graded slab is supposed to remove doubt. That is exactly why counterfeiters target slabs: a buyer who trusts the label stops inspecting the card. Fake slabs are a real and acknowledged problem — PSA warns on its own cert verification page that "criminals do attempt to counterfeit PSA grading inserts using actual certification numbers" taken from public sources. This guide is deliberately conservative. It will not teach you to eyeball a fake from a photo thumbnail; it will give you a verification process that stacks several independent checks, because no single check is sufficient on its own.

Start with the cert number — but do not stop there

Every legitimate grading service prints a unique certification number on the label and operates a public lookup for it. Checking that the number exists is the first step, not the last. PSA is explicit about the limitation: "Verification of certification numbers on the PSA Certification database does not eliminate risk," precisely because counterfeit labels are made using real cert numbers copied from genuine slabs. A cert that fails to appear in the database is close to disqualifying; a cert that does appear proves only that the number is real, not that the slab in front of you is.

The check that actually bites is the match. When the lookup returns a result, compare every field against the physical slab: the card name, the set, the card number, the language or variant if listed, and the grade. A real cert number attached to the wrong card, the wrong year, or the wrong grade is the classic signature of a counterfeit insert. If anything disagrees, walk away.

Use each service's own verification tools

PSA — enter the cert number in PSA's certification database and compare the returned details field by field against the slab.
CGC Cards — use the cert lookup at cgccards.com/certlookup, or scan the QR code on the back of the label. CGC's lookup links to high-resolution images of the card captured during encapsulation, which is a powerful check: you can compare the exact card in the holder — its centering, print characteristics, and any visible flaws — against the photographs CGC took of the genuine article.
TAG — every TAG slab carries a QR code linking to its Digital Imaging & Grading (DIG) report, with high-resolution defect imagery of the specific card; certs are formatted as one letter followed by seven numbers and can be searched on TAG's site. TAG slabs additionally carry a PROOF security mark behind the QR code, which TAG confirms and scans before the slab leaves its facility and which you can verify yourself with TAG's free Proof Authentication app.

Where a service offers photographic records or an authentication app, use them. An image match between the card in hand and the grader's own photos is far stronger evidence than any label inspection.

Inspect the holder itself

Genuine holders are engineered to make tampering visible. PSA cases are sonically sealed and tamper-evident; CGC's holder is ultrasonically welded and built to resist tampering, and its label carries layered security features — microprinting, UV ink, holographic foil, and a barcoded cert number. TAG dispenses with the paper label altogether: the grade and data are inscribed directly into the acrylic. That design intent tells you what to look for: examine the seams and edges of the case for signs it has been opened or re-joined, and treat any slab that looks pried, glued, or re-sealed as compromised regardless of what the label says. Familiarize yourself with the current holder and label designs on each grader's own website before buying, so that a wrong font, a missing security feature, or an off layout registers as the anomaly it is.

Buying hygiene

Most protection comes from process rather than forensics.

Insist on clear, well-lit photos of the front and back of the slab, including the full label and the QR code. A seller unwilling to photograph the back of a slab is telling you something.
Run the cert lookup before you pay, not after, and verify the field-by-field match described above.
Prefer sellers with an established track record and a genuine return policy, and platforms with buyer protection. A counterfeit discovered after a no-returns cash deal is simply a loss.
Be suspicious of high-value slabs priced far below the market. Underpriced grails are occasionally real; they are also the standard bait.
Do not rely on folk tests — weight, sound, or feel — as evidence of authenticity. Stack the documented checks instead: cert match, image match where available, holder inspection, and seller quality.
When something feels wrong and the money is significant, contact the grading service before completing the purchase.

The mindset

Treat every slab as unverified until the cert, the card, and the case have each been checked. This is not cynicism; it is the same discipline the grading services themselves encourage by publishing lookups, photographing cards at encapsulation, and building tamper-evident cases. A few minutes of verification is a trivial cost against a grail-level purchase, and sellers of genuine slabs have no reason to resent it.