Everyone carry. Signs don’t matter. **IF** you are found out... short of dropping it I don’t see how.. they can only tell you to leave.
And if they shoot the mall’s rent-cops dead, what then? Its an open shooting gallery inside.
I do that, screw them all. Here in Texas we have a legal signage they can post to disallow carry on certain property. We call it the .30-06 sign (after section 30.06). Places with that sign I avoid and they do not get my business (except I do carry into hospitals) all other “No Gun” signs usually get some chaw spit on them as I walk by. If they catch me ask me to leave and me and my money will oblige.