First, check the terms of the policy with your agent. Second, take photos and/or videos. Your agent should be able to keep a copy for your file as the info could be put on a disk which doesn't take up much space. Had to sue an insurance company when we had 12 guns stolen. Their claim was we didn't have all those guns, three of which were my grandfather's. This didn't cover his watch when he worked for a railroad and his coin collection; no way to put a value on them.
Edit- this could apply to everything in your house.
Life is like water-skiing; if you slow down, you go down.