Fifteen years a fan, four years a member of TeamAyu... Never had the opportunity to ask "what should I do with these stickers" lol. That said, I never would anyway cuz I just keep everything, hahaha.
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But yeah, Yahoo Auctions is usually the only way I can even find out what the venue-only benefits even ARE o_O!!
(And there are some older items that do seem to be official (they appear to have high quality printing and the appropriate copyright/trademark markings on them), but I don't know where they're from, so I dunno if they were novelties that were mailed to members or things that TA members could purchase or venue exclusives or what! o_O!! I must admit, avex don't do a good job with making TeamAyu feel like a team of any kind o_o)