Al, I don't know about the claim process. Someone did describe it in an old thread here and it seemed smooth. For the collector-grade insurance they only make you schedule things that you value at $5 k or more. I would assume a claim could be filed by demonstrating the loss and showing the sale price of the item, but I am not sure what they require in the way of proof. Depending on the value of the item you ship, you have to ship it using certain carriers or service levels to be covered, so you can end up having to pay for signature confirmation. There is a chart in the policy that clearly says how they cover different shippers.
The website:
https://collectinsure.com/