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In Australia, a magazine bought at auction a lot of lost flash drives that had been lost on railroad cars. A surprisingly high 2/3 of them contained malware. I've never personally found a flash drive "in the wild", which is to say misplaced outside of the office environment. I must say that I find the question of whether some people "lose" them on purpose with the intention of installing malware on the finder's machine interesting. It seems rather unlikely to me, given the cost of flash drives left laying about in the hopes of an unwary finder, and that finder not being someone with nothing to offer for the miscreant to gain. As a rule, I don't go around opening unfamiliar files willy-nilly, and I think that should apply to DVDs, flash drives, SD cards, etc. found laying about.