Just want to clear something up.
The US Postal Service is closing up a lot of small post offices at the same time they are entering into agreements with private businesses to provide "postal services". MANY of these PRIVATE BUSINESSES have all manner of "US POST OFFICE" or "US POSTAL SERVICE" signage, banners, etc. on the front of their buildings as well as inside. Many are just a counter within an existing business......HallMark for one example.
THESE ARE NOT US POST OFFICE FACILITIES and federal employees DO NOT routinely work within them. As such, they ARE NOT prohibited places for lawful firearms carry.
So, if the sign says "US Postal Service" and "contract partner" (or similar), it is NOT somewhere you must disarm.
"The Second Amendment speaks nothing to an unfettered Right". (Post # 100)
"Restrictions are not infringements. Bans are infringements.--if it reaches beyond Reasonable bans". (Post # 103)
Disclaimer: I am not a lawyer, nothing in any of my posts should be considered legal advice. If you need legal advice, consult a reputable attorney, not an internet forum.