If you haven't done a google search of the VIN, I'd try it. A lot of car marketplace sites require a VIN to be included with a for sale ad for a car. If it has gone through a path like this it might give you some clues.

Besides a google search, some states have a VIN lookup which might help you narrow down your search a bit. For example in Ohio you can see if a car is titled there and which county it currently resides in but you won't get owner/address info. If you can get the general geography figured out, perhaps a board member in that area may recognize the car.

Ohio Title Lookup: https://bmvonline.dps.ohio.gov/Search/Title