Start with the seller and the terms
Authenticity is a process, not a visual trick. Check the seller's identity, business history, return window, written authenticity promise and dispute process before transferring money. Be wary of urgency, unusually low pricing and claims that an accessory or code settles the question. Hong Kong Customs advises consumers to buy from reputable shops or websites and to check with trademark owners or authorised agents when authenticity is in doubt.
Ask for current, item-specific evidence
Request high-resolution photographs of the exact bag: front, back, sides, base, interior, lining, handles, strap, hardware, seams, stamps and areas with wear. Ask for a timestamped image and written disclosure of repairs, replaced parts, recolouring, odour and moisture exposure. Generic catalogue photos cannot document the actual item.
Treat codes and accessories as clues, not proof
Date codes, microchips, authenticity cards, receipts, boxes and dust bags can support provenance, but systems vary by maker and year, and accessories can be separated from the bag. A copied identifier can appear on a counterfeit. Compare model-specific construction with reliable references and consult an independent specialist for a high-value purchase.
Make the decision reversible
Use a payment method and platform with meaningful buyer protections. Keep the listing, messages and invoice, and arrange an independent inspection within the return period. If the seller refuses clear photographs, specific answers or written protection, walk away. No online checklist can certify a bag from one image.