A fake video camera might keep people away. A coworker once had trouble with someone taking stuff out of one of his cabinets. He rigged things up so that if anyone opened the cabinet, they would be looking face-to-face with a video camera with a flashing LED on the front. The "video camera" was a cardboard box painted grey, with a stockroom magnifying loupe glued on as the "lens." The only circuitry was a battery to power the flashing LED.
See my post 44 up thread.