Yea I mean if you have a policy worth 50k then they will pay up to 50k in damages, if it turns out that you do not have that much stuff then they will pay up to the point of what you had and what you lost..
Most companies now pay replacement value on the lost goods.. which works better for the insured than book value.. so you get what the items are worth today, you will most likely have to provide them with a list of items lost or damaged during the catastrophic event in order to receive your payment..