ask the car hire company if their insurance covered guest effects (that is properties of the clients) if not, you are kapput, alternatively, if you had a domestic package policy for your houshold belongings and your laptop was insured under all risks cover, you can approach your insurer who will compensate you.... in the absence of that, you are still kapput. Approach me and I will help you get proper insurance for your little things that matter most in your life.....