If you send it tape on a piece of paper in a envelope. Just write "Please! Hand Stamp" on the envelope with two forever stamps on it. I use to work for the USPS in 1997-2000. They have too hand stamp it. I send mail that way all the time. My mail has never been sent back or harmed.
I lost a ring that way,,it got on the other end empty,,the machine caught it and ripped it right out lol..the person got the envelope wrapped in plastic from post office saying sorry bout the condition lmao