Finders keepers/Losers weepers is only valid until you turn five.
After that, it's stealing.
(Written by a woman pissed off that someone found her $10 flash drive in a computer at school and took it--with the latest version of her novel, and all her rewrite notes, not to mention all her homework--on it. And yes, I had a fairly recent backup, at least of the book.)
Find this, asswipe.