Hopefully you can get this sorted out. I am sure no one, including me, wants this car to just disappear and at the same time with the ownership in question there could be consequenses for everyone including those purchasing the parts.
And it does sound like someone once cared very much for that car.
So many of these cars are registered on different databases. I wonder if there is some way to search through them, if not there should be. I have long been somewhat uncomfortable with the thought that blank tags can be purchased and the numbers can be easily changed. Of course I am sure these things have never occured to anyone else.
I guess what I have been trying to say is this, if we owners do not look out for each other who will. We did when the 'scammer' was cheating people with the fake sale ad recently. Seems to me that however well intentioned or inocently it happens this could be a variation of that same thing.
I don't know about you or the rest of the folks on this forum, but I would not be very happy if my car was towed or stolen and someone 'found' it and did not at least make an effort to find me.
Hope this all works out for you in the best possible way.