I have to agree with everyone here..... i was in a wreck a couple of years ago, & the head to my /\/\ Syntor ( A9 by the way ) was missing when I went to the garage to retrieve my stuff. I know it was in there because I used the radio to call in the accident. I spoke with the owner of the garage / towing company, and he said his people denied any knowledge of it. I called PD, had them come to the shop, filed a stolen property report. Shortly there after, the driver of the tow truck produced it, and was arrested for posseion of stolen property. If I were you, and my vehicle was still at the garage, or storage facility, file a stolen property report, and then report it on insurance. At least if you report it stolen, you may have more leverage with insurance.
Also, was it a unit actually INSTALLED, or afixed to the vehicle, with outside antenna? The reason I ask is, some insurance companies try to be funny, and say that if the accesory was not affixed to the vehicle its not covered. This is BS. As long as it was in the vehicle, it is covered. PROVIDED, you have full coverage, or at least coverage to cover accessories. Just my .02, hope it helps, and good luck, hope you feel better soon!!!