even if they had signs they hold no legal weight. all they can do is ask you yo leave, at that point if you choose not to then they can change you with armed trespass.
Archbold in Thomasville has recently plastered these signs on their doors,
my wife works there and was irritated that I still carried when I meet her for lunch some times. I told her that sign means no revolvers, and I don't carry a revolver so I am good....
but I did have a good conversation with the head of security about it about 10 years ago when I worked there and he agreed they had no legal leg to stand on, BUT there are so many people, I mean sheeple, that will just roll over and comply that the administration decided to have the signs installed.