They can post all the signage they want don't mean anything to me - I still carry in COSTCO here in ID as they are not on the restricted carry list according to the law! Meaning they can't tell me where I carry. All they can do is ask me to leave which they will not as they will never know I'm carrying!
Truth be told Idon't think there is a sign on the COSTCO here? Not that I care if there was.