We could use some input on how to "value" artwork that has been damaged. A good customer brought us several pieces that are damaged beyond repair due to a flood. The framing end of it is simple. But some of the artwork is simply old poster quality artwork on cardboard...but it has "sentimental value". How in the world do we list these on the estimate for the insurance company? I thought of simply saying "artwork not replaceable" and show no value. Help please....and thank you!