I also found that the best way was to have them as "Specified Items" on your policy and pay a few bucks more, or increase your contents cover to account for them in the total insured value........... I have been with the same insurance company for 20 years and they will cover them up to certain value ($1k) even if not listed separately.
My insurance company asked for a list of anything that I owned of value including serial numbers. I have a digital photo album of the machines also which has pics of all areas of the machines plus pics of the serial numbers etc .............. Saved on my computer on mine and the wife's keyring flash drives and a spare copy at mums and my brothers.... Can never get lost or damaged then ....
