A limited edition fifty pence piece that was released in 2016 could be worth hundreds or even thousands of pounds.
So get checking underneath your sofa, in your pockets or even the pavement as only 15,000 of the Beatrix Potter 150th anniversary edition coins were created.
Users on eBay are selling off their coins for up to 20,000 times their worth.
The coins feature the likes of Peter Rabbit and his friends with their names embossed around the edges.
Have you had your hands on one of these? Do you own one now? Let us know by tweeting us @NTUJournos.