You know who you are! (I would name you but 1. you don't seem to exist now and 2. it's against the rules to call out players.

I logged into the game just now and some random stranger had mailed me 160 gold. No note, just gold. I thought it must be a mistake, someone trying to mail gold to an alt, so I tried to return it and it said no such player existed. So thank you random stranger, in all my years of playing, that was a first.