Jus Cruisin,
Go to Carfax.com and try entering your motorcycles VIN. I did, and they recognized the VIN and offered a report. I also tried to change one number to trip them up, and it would not accept the number, so it seems they've got it nailed down.
For that to occur, someone obviously must have supplied info to them. Seeing I've never had a warranty claim, I suspect it was either Harley themselves, the selling dealer, the DMV, the insurance company, or all of the above. I've also heard of some folks with boats mention listings, so while your thoughts of there not being a motorcycle version of Carfax is technically correct, the fact seems to be Carfax itself handles anything with a VIN number, provided they have a record. I honestly do not know how they get the info, but it's obvious they've got accurate sources or they'd be getting their butts sued.
That said, I know there are are laws regarding automobiles requiring the disclosure of damage over a certain amount to new vehicles. I have every reason to believe such a requirement would logically pertain to motorcycles as well. It might be a just an Illinois law, but I got a sweet additional discount on a car I special ordered which got the front fender replaced due to a shipping incident. In order to accept the deal, and take delivery, I had to sign a legal release of some sort. If the dealer was able to do a simple under the carpet switcharoo, they would have had every incentive to do just that.