Before buying a raw card at a show, confirm the exact card, set, variation, language, and condition. Inspect corners, edges, surface, centering, back, gloss, print lines, creases, dents, stains, trimming concerns, and signs of alteration. Ask before removing a card from a holder. Use the events calendar to identify the organizer, but remember that an organized floor does not authenticate every item on every table.
Compare recent sold prices for the same card in similar condition and decide whether the no-shipping, in-person inspection advantage is worth any local premium. For expensive cards, consider a second opinion, a graded copy, or a dealer with a written return policy. The show-floor authentication guide and raw vintage condition guide explain what to look for. If the seller rushes the inspection or blocks reasonable questions, walk away and use local card shops or another show for the next opportunity. A careful no is better than owning a problem card you were too rushed to examine.