publinc low level officials neer ceases to amaze me. While I doubt that any law suit would be brought against you, you certainly should file a complaint with the U. S. Postmaster General; with your local Postal officials and with the U. S. Attorney for your district. The threat of a law suit for "destroying" government property in the form of a postal label is nuts. I think that this could play out to a major motion picture: The Grinch Plays Postoffice.

Good luck, Charlie. And no they cannot bar you from using the P.O.