(CNN) - Empty out your change jar, you may have a coin worth a lot more than you think.
A rare nickel just sold for over $3 million at an Illinois auction. It is one of only five 1913 liberty head design nickels and has a crazy back story.
The coin was uncovered after a fatal car accident and thought to be fake, so it stayed in a closet for 41 years.
A nationwide search ten years ago brought the nickel out of hiding. A group of experts authenticated it during a secret midnight meeting.
So far, more than $40 million worth of historic currency was sold during this week's event.