More postal lore

My customer told me that there are far fewer blue mailboxes than there used to be because of vandalism.
Mail carriers used to find balls of masking tape inside blue boxes all the time. A thief would make a sticky ball of tape and drop it into a box at the end of a piece of string, fishing for letters. The Postal Service responded by installing jagged teeth inside the box to cut the string.
Some thieves broke into the boxes. Others unbolted the entire box from the ground and set it up somewhere else as their private piggy bank. Unsuspecting citizens would come by and put their mail in.