Use the grading company’s official certification lookup, compare displayed details to the physical holder and card, and inspect the label and case for tampering. A matching certificate number alone does not prove the slab is authentic because numbers can be copied.
Join the discussion: What extra checks do you do when buying an expensive graded card online?
Share exact card details and dated, verifiable sold results when discussing values. This is a community discussion, not a guarantee of authenticity, grading outcome or future prices.