So in theory if they didn't have a sign at EVERY public entrance then you could argue that it's not a valid OC ban. Would be quite the fight but I would think one could win.
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Pieces of paper tend to blow away in the wind......... Hint, hint........[Tooth]
throw the piece of paper away.[Beer]
first rub the paper in some dog doodo, then put it in the trash...
Bottom law is that open carry restrictions are not preempted. They are enforceable.