[suicideneil]

Serial number on the box vs the thing itself?

Any distinctive marks or scratches etc?

Distinctive batteries?

I'd assume also it might have certain places pre-programmed into it that you can bring up on the menu etc?

I would go round there with a local police officer- he can ajudicate as you inspect the gps to see if its yours or not- if the theif can t prove ownership ( no box, mount, instructions, receipt etc ) but you can ( have all those things the theif doesnt ), then it should be easy to determine the true owner.