I recently had the same situation with the insurers of our new boat. In the end I just gave in and signed off that all recomendations regardless of how insignificant had been completed. They did not request reciepts. So now the pressure is on to get after those little problems quickly and hope that there are no related claims in my future. I've never had a claim, but I'm sure that they'll be keeping my survey and sign off in hopes of not paying if I ever do have a problem.