Rubber band? You got lucky! I’ve had two boxes in the last two months jammed into the mailbox to the extent that I thought I was going to have get the Jaws of Life to pry the mailbox apart enough to extract the boxes. Fortunately, the items in the boxes were well packed and despite the damage to the boxes from semi-extreme extraction menthods, what was inside was ok. The mail carriers will do just about anything not to get out of their trucks and come to the door with anything.
Haha, you are right, I recall that happening here, too.