
BTW I've sent my movers my insurance evaluation form plus copies of my passport and visa, as they requested.
The 3299 itself is a strange looking form, my movers provide lots of notes to stop me from screwing it up. There is even more information on Google (though searching for "3299" will get you the form but little else).
The 3299 arrived with a "Supplementary Declaration For Unaccompanied Personal And Household Effects" an "Alcohol Inventory" (fortunately I don't drink) and, more worryingly, a Power of Attorney form...