I go there every couple of weeks (..my wife is a gamble-holic, lol). I always carry. I specifically looked for signs and have never seen them. Stay concealed, and don't ruin a good thing by asking their security/management a question that you might not like the answer to. (the O.C. radicals will probably flame me for saying so, but would definitely not recommend trying to open carry there).
btw, I've never felt threatened by any of the patrons there - - most of them are on social security, your typical back-woods good 'ol boy type folks, or your blue-collar landscapers & gardners there to blow their paychecks after work. I've never seen any aggressive drunks, or the other stereo-typical trouble maker types there. Probably the main reason I do carry is the trek to/from the somewhat dimly-lit parking garages.