I was in Clear Lake Iowa yesterday for the 49th anniversary of that fateful day and heard several "guesses". One being Hubert Dwyer , the owner of the plane, had it carted off for scrap. The scrap hauler buried it and died shortly thereafter and no one knows it's exact whereabouts.
The other version is that Dwyer fully realizes it's historical value and is hoarding it away. Don't get me wrong, it's not like I want to see this awful mess, but I think much more could be learned about this tragedy if we analyze the plane itself. Personally, I think the first guess is hogwash. I'm doubtful of answer #2 also because how could you store such a large, significant piece of Americana without showing it to a couple of buddies, a relative, or anyone at all and expect them to stay tight-lipped about it for 49 years! Anybody know?