Enter or scan the complete certificate number and compare every returned field with the exact object in the listing. Check the signer or subject, item type, card year and set, grade, sticker or label number, and any available provider images. Ask for current front-and-back photos, review seller history, search for duplicated images and use protected payment. Save the listing and lookup result for valuable purchases. A certificate lookup is a strong first screen, but provenance and the physical item still matter.