I always thought about putting a large piece of ABS pipe in a large mailbox and filling in around the edges with concrete.

Then mount the thing on a steel post set in concrete.

Perfectly acceptable to post office and I would assume surprisingly painful for Casey.

But then, I never had my mailbox vandalized.

I had a side-by-side refrigerator carton for a spaceship when I was a kid. I drew controls all over the inside with crayons.