And this is who lives in there! A blue-tongue lizard, about 25cm (10 inches) long, spends much of his time under a piece of polystyrene. He climbs in and out of the box through the letter slot. (We lifted the concrete top off the letterbox and removed the polystyrene so we could photograph him.)
The postman doesn't know he's there, and I won't collect the mail!
..... the grandchildren have no such qualms.