Look at the pictures. The wings ended as pools of melted metal.
The actual investigation documents would have filled many boxes. What has been published is just the highlights. It may well be that there is an archive in a warehouse somewhere containing all the documents generated during this investigation. That would be a treasure trove to find.
As my document explicitly says, that's the reason for going public - to shake those boxes of materials out of the trees. Someone out there has something, and I'm depending on word of mouth in the flying community to bring it to light.