You must go by the “letter” of the law!
Next time youre in there, copy down the cites on the little poster they have there about weapons and actually look them up and read them.
I think you will find they are conflicting, and if you think about it, it also makes sense.
I have two friends who up until a few years ago, were both Postmasters in little rural PO's. Both have told me that one of those cites refers to the postal employees, and the other, to the patrons. It depends on who you are and what youre doing there on how they apply.
Its been a while since Ive read the actual cite, and unless its been changed in the last few years, "our", the patrons cite, states (towards the end) that if you are there for official business and/or "any other lawful purpose", its not against "the law".
Again, if you think about it, how can you go into the PO and ship a gun, if its against the law, to have the firearm there to ship?
Most all of these "laws" that appear to restrict your "rights", have that "any other lawful purpose" clause, somewhere in, and usually at the very end of the law. Kind of interesting, isnt it?
They are counting on you to not ask questions, or question their authority, and "do as your told", as most have been conditioned to do these days.
Call the PO and ask, and most of them dont seem to have any idea, and they will just tell you its illegal. If you want to have fun, ask them why one says you can and the other says you cant. There seem to be a lot of pay grades involved here too, and they all seem to be below the one that has the answer.
Or, you can just shut up, dont ask silly questions and do as your told, like a good little tax paying citizen who really has no rights.