A neighbor of mine (with an attractive daughter) used to lose his mailbox almost monthly. Bats, ropes, and small explosives usually, but once he found a bowling ball in the debris. Cured the problem with a steel post mounted large rural mailbox inside which he fitted a ten inch steel pipe. He poured concrete into the voids between the pipe and the mailbox. It’s got all sorts of impact scars now, but it stands.
A neighbor of mine (with an attractive daughter) used to lose his mailbox almost monthly. Bats, ropes, and small explosives usually, but once he found a bowling ball in the debris. Cured the problem with a steel post mounted large rural mailbox inside which he fitted a ten inch steel pipe. He poured concrete into the voids between the pipe and the mailbox. It’s got all sorts of impact scars now, but it stands.