Now that's a good idea.

You know those keychains you get from banks when you get a credit card or open an account? I had one of those but mine was from Kroger when I signed up for one of those cost cutter cards. I lost my keys after a car accident and about 6 months later, Kroger called me and said I could pick my them up at the local store. Apparently, someone found them beside the road and dropped them in a mailbox.