Left SM64 DS card on a table. Went back FIVE minutes later, and it was gone, as if someone was waiting for me to leave it there. Anyway, I don't think you stole it, but it really isn't the right thing to keep it. You got lucky Nintendo unlocked it for you, but at that moment you could have asked them for the owner. I mean, the person who set up the code might have gone on the Internet, which Nintendo tracks activity of, which also means they could have tracked some location where the owners were. At least, if I'm not mistaken that Nintendo does keep locations... I'd be damned if I'd let someone take my 3DS, especially since I have a lot of personal stuff on there.