GRRRRR.... I feel your pain brother. If you don't have a surveillance camera, think about getting an IP Camera, or a DVR with CCTV cameras and point one at you parking area. It helps to know who helped themselves to your stuff. I have one pointed up my driveway, one pointed at my garage/workshop, one pointed towards the street where I park my truck, and one to pan the front street/sidewalk area. They ALL record continuously.
Charlie