This is a true story.
We bought a fix-me-upper house about three years ago. It's costing us some serious cash. While doing the renovations we recently found a small brown box shoved to the back of a tall cupboard shelf.
Inside the box was a gold coin:
Wonderful, eh? Current value of the coin is about $1000 USD.
Also inside the box was a receipt from the purchase of the coin and purchaser of the coin was the lady we bought the house from. She's retired and lives in a small assisted living community in our neighborhood. There's no doubt it was hers.
So, would you keep the coin or return it?