hmm i doubt anyone will give u invoice or receipt when he is a user himself (not a shop or company selling lens).
O I mean the receipt he got from the shop when he buy the lens. Some minimum proof that he is the original buyer. If he raid a home and took the lens with receipt then bad luck.
seldom keep. and im nt the only one
If don't have receipt, then will do a search on posts etc. Normally more post will feel safer. Little post one normally ignore because paranoid :bsmilie:. Senior member status and frequent in CS one feel more safe. Moderator status then 99% safe hehe.