John, I don't know if you have been following the similar thread started by Michael (iCe) last week (Stolen Image), but he is going through the same thing. Also don't know whether or not you belong to PPA (I don't, because I'm not a pro, and there are those who say I'm not even a photographer

). Anyway, in Michael's thread there is a posting from Jennifer (jenmazy) that says that even if a person was not a member of PPA at the time his pictures were stolen, he could now join PPA, and their lawyers might still be able to help you out. Might be worth a phone call or two.
Just a thought....