TexasCHLforum.com

Agreed Coastie. Invalid is the operative word. The sign is invalid, and if taken to court because you were arrested while carrying in that mall, in all likelihood you'd be acquitted and set free and get your gun back.

Is it to be ignored? Well, that's up to you. If the police view it as valid, then you are fair game to be arrested, IMO.
The next question should be what kind of payment plan can you work out with your criminal defense attorney when you are(arrested)? It can be an expensive proposition.