I don't think it is unreasonable for them to ask for serial numbers, as without such one could claim they owned any number of firearms theat they never had. They need a VIN to insure a car and a copy of the title to uinsure a house. Basically, they want proof that you actually owned these things. Just be glad they don't want to send an agent to your house and photograph you with each one, along with purchase reciept. I think the fact that they are willing to insure them one serial # and brief description alone is quite trusting. One could very easily provide #'s to guns they used to have. I don't think most of us would, because it would be wrong and insurance fraud carries a hefty penalty.