I thought this paragraph from the FAQ's was interesting. Hadn't heard about this before:

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Q. Does the insurance provide mail and shipping coverage for Internet sales?

A. Yes. If you sell duplicates and unwanted items from your personal collection mailing and shipping the items to the buyers is automatically covered. You have coverage for First Class, Airmail, Priority, Global Priority, Parcel Post, Book Post, Certified, Insured (when a signature is required), Registered and Express mail and when shipped by UPS, Federal Express, Airborne, DHL, TNT, RPS, United Parcel Service (UPS), an air freight carrier and other similar shippers. Also, if you sell collectibles on the Internet as a dealer you also have mail and shipping coverages. Contact the CIA office for details.