My DIL sent her sister a birthday card with a Wal-Mart gift card it in from a secure locked mailbox in their neighborhood. When her sister received the card, the envelope had been slit on the side & the gift card removed. She was able to track down where it had been cashed in & it was in the same town where they live & her sister lives in another state. She knew it had to be a postal employee because no one else would have had access to the locked area of the box.