Someone left a $15k diamond ring in an unlocked car along with a note saying, "Hopefully this will land in the hands of someone you love, for my love is gone now. Merry Christmas to you."
The CNN article linked above is subheaded "Anonymous man puts jewelry in unlocked car." Aside from the note - which might have some forensic significance to a handwriting expert - there's not much else known.
So why do we assume a man left the ring?