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If I get stuck and have to leave my gun in the car, I keep a small combo safe under the front seat, cabled to the frame. It's not the most robust safe, but it is concealed and it will deter a smash and grab.

GEM-Texas, it's easy enough to look up the HEB on the TABC web site and verify their license. I'm betting it is "Gun Sign BLUE". If they are posting the incorrect sign, you should file a complaint with the TABC and lt them handle it.