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JKMost insurance companies that are in business to insure your home first and its contents second are not good choices for insurance for the reasons stated above. However, Collectibles Insurance Company is specifically in business to insure collectibles such as cards (there are one or two other options as well). They do not require that you inventory your collection and have never (according to their website) denied a claim based on the failure to have a complete inventory. I use this company to insure my cards (as well as a bank vault). The insurance is relatively cheap and covers shipping losses as well fire/damage/theft/etc. It is also A+ rated (I think that is the highest rating in the insurance business). Here is a link to their Q & A page:
http://www.collectinsure.com/faq.htm>