Re: Registration nightmare
Plenty of threads regarding issues like this. In NY, you'll need a title (if the former state was a title-issuing state), or a transferable registration signed over to you, plus the bill of sale which sometimes they require to be notarized, sometimes not.
Once, on a sea-doo I purchased from out of state, I slipped the BOS by DMV by just having
my signature block notarized, but not the sellers, since I hadn't done it at the time of purchase and didn't want to deal with mailing the BOS back to the seller and hoping he would actually care. Patted myself on the back for that bit of quick thinking all summer long
Bottomline, with just BOS in NY, you're hosed.