When I got all my guns insured I was told to document the serial #s, all the dings and dents and also to have a photo taken with me holding the individual guns to prove I did indeed have possession of them. I did so and then put all the paperwork and pics into my safe in a single file folder. I've never had to use the insurance but it makes me feel better having it. If I sell or buy a new gun I simply update the file accordingly.