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Use the Birkenstock eBay checklist before comparing used pairs.
Birkenstock check
Birkenstocks are simple shoes, but the used market is not simple: popular Arizona and Boston styles attract fakes, and a worn footbed can make a cheap pair feel expensive. Start with proof and fit before chasing the discount.
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Action checklist
Use the Birkenstock eBay checklist before comparing used pairs.
Save the Birkenstock checklist card when you are checking multiple listings.
Skip listings that hide the footbed, outsole, or size/width marks.
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If you use it in a forum or Q&A reply, lead with the checklist summary and only add the link where it genuinely helps the buyer.