The Mystery of the Missing Mailbox

Yes, we were rolling out to town and at the end of the "driveway", find that our mailbox is GONE.  The post was listing a bit but otherwise, there was no mailbox in sight.  We looked up the road, and down the road, and even peered into the field in front of us.

NO JOY.

I have no idea. I can't even begin... *shakes head in disgust*