i don't see any reason why these genuine items cannot be insured....i would talk to your insurance company about it -- tell them collecting watches is a hobby and you have lots of spare parts (dials, cases, movements, etc) that you want to make sure are insured. it would probably help if you had receipts of some sort for these, but i'm guessing you can get them insured for replacement value some way or another....
if/when you talk to your insurance company, post back here if you can remember -- i'd be interested to hear what they say about it....
deltatahoe