ForkinGreat
Knows his Brassica oleracea
Proxy =scam. registered buyer/eBay user who paid for the bike WITH Driver Licence or GTFO. Photograph both sides of DL + them. Get them to sign a form as other poster said that they are happy with condition of bike ie it is as described in eBay listing, and have taken/received the goods.What @moorey said.
I wonder if you could insist that the buyer themselves must collect the bike ie. no proxy, and you draw up a simple document that they sign to acknowledge that they’ve personally inspected and are satisfied with the bike and have collected it. No idea if that would “protect” you against scam buyers or not.
Or you could just do what @The Reverend suggests.
NO PROXIES.