Wasn't it 44 that would be hiding in the mailbox and such?
I think he was called Larabee.
Hope you don't mind me butting in, but I thought it was 13 who was usually in the trashcans and mailboxes.
That's the guy. First 44 was Victor French, who was in Highway to Heaven. Another actor who played 44 was Al Molinaro from Happy Days. 44 was always concealing his big self in mailboxes, medicine cabinets and vending machines.