One of the few pieces we've mailed with no stamps! It seems the postal service has a very nice policy of returning lost keys for free if the owner's address appears on them... even if that owner uses an old sock as a key chain! We really have no interest in taking advantage of this policy (and do not condone others to do so either), but Dennis had to do it at least this once to add this niche of the USPS service to our collection. Chad never figured out what these keys open.