Now you haven't said (at least not that I've noticed), but I'm going to assume that this device has some sort of user input (keypad, touchscreen, pushbuttons, something). That being the case, and since I'm also now assuming it is wirelessly networked, you could incorporate a gps chip that will report its location anytime someone tries to use it without first entering the correct password, or without the rfid tag nearby, or without first scanning their fingerprint or whatever. If I were doing this I would probably make it report its position periodically (every 10 seconds or 60 seconds or whatever is as frequent as possible without letting the theif notice the use of bandwidth and processor cycles) until the user authenticated that they had possession. What's more, I'd bet that gps chip costs less than the materials you're going to need for that shock sensor. In fact, it's probably no more expensive than a simple mechanical switch.

No,No some sort of user input (keypad, touchscreen,)
Above are manufactures design.They have lot of moneys and experiments with their lot of measurement tools.

THank you
Jeckson S Ben