There is probably a placard on the wall near the service counter. If there is no notice at the entrance but there is one inside , that would constitute a bit of a trap...
OTH , I believe that as CC permit holders we are responsible for knowing federal law such as no weapons permitted in a federal building. Been a while since I got my training but I think that was covered.
They are usually up on the board with the other notices. Its nothing big and really noticeable either, and easily missed if you arent paying attention.
Keep in mind too, if you believe that sign to be correct, "ALL" weapons on your person are in violation. Pocket knives and any other thing that might be construed to be a weapon falls under that. Think "metal detector" at the court house and what they will pounce on. You boys leaving your guns are leaving all that crap too, right?
In the past, and in some places, its still so, places like the federal courthouses, and our local courthouses, etc, had a lock box where you checked your gun and whatever else you had on you that was verboten. I had federal jury duty back in the late 90's, and got to walk past all those in line (and they were long lines) and the cattle chutes and just told the Marshal I had a gun and he pointed me to another Marshal where I could check it. All I needed was my permit and DL.
A friend asked to do the same after 9/11, and they werent doing it anymore. That in itself seems to be illegal to me, but, what do I know.
In our state, its a law that all courthouses have lockboxes so you can check your gun, and its supposed to be posted as such, but I havent seen that sign at our courthouse here.
Heres that specific part of the "law"....
(e) Facilities for checking firearms or other dangerous weapons.--Each county shall make available at or within the building containing a court facility by July 1, 2002, lockers or similar facilities at no charge or cost for the temporary checking of firearms by persons carrying firearms under section 6106(b) or 6109 or for the checking of other dangerous weapons that are not otherwise prohibited by law. Any individual checking a firearm, dangerous weapon or an item deemed to be a dangerous weapon at a court facility must be issued a receipt. Notice of the location of the facility shall be posted as required under subsection (d).
The big problem I see here isnt the supposed law, but the fact that we allow them to tell us we cant do something that is supposed to be a right. Of course, these days, everyone has been conditioned to do as they are told and dont question, so here we are.
And thats exactly what Im seeing here. Dont question, dont bitch, just follow the "rules" as you are "told" they are, even if they violate your rights. And it appears, more than not, are doing just that.
Unless they have changed that cite on the poster in the recent past, and you are not a postal employee, the lobby and public areas of the post office, fall under that "any other lawful purpose" paragraph that was at the bottom of the cite. Or it seems to me that they do, as I read it in English.
Unless too, English really isnt English, and words dont really mean what they say, if someone doesn't want them too, in the moment.
Greenspan sums it up nicely.....
“ I know you think you understand what you thought I said but I'm not sure you realize that what you heard is not what I meant”
― Alan Greenspan
Sounds like every law on the books!