I've used Import to replace or recreate a listing I've accidently damaged or lost during cleaning.

I'm going to make an assumption that the Listings you are Importing didn't originate from Auctiva or use Auctiva hosted images. That's the normal case for using Import, i.e. to help migrate listings to Auctiva.
If you examine the original Listings on eBay, are the pictures there? Were the pictures hosted on eBay?
eBay does have limits on retention of old listings (usually 90 days), so I'm curious if these are recent listings too.
Not sure why it would drop-out the Shipping Fields. If you can post a couple of the eBay Listing #'s for those you imported, it might help.
Danno