Instead of finding something missing from his unlocked car, a Massachusetts man found a $15,000 ring.

An anonymous person left a diamond engagement ring in an unlocked car with a type note speaking of their broken heart. The note read: "Merry Christmas. Thank you for leaving your car door unlocked. Instead of stealing your car I gave you a present. Hopefully this will land in the hands of someone you love, for my love is gone now. Merry Christmas to you."

Four days after the three diamond ring with a white-gold band appeared in the man's car, he reported it to the local police.

"This appears to be random," Westborough Police Lt. Paul Donnelly told Reuters. "I think there was a search for a car that was unlocked."

The man decided to keep the ring after learning it was worth about $15,000.