What bothers me is pretty much the same as you - where are the originals? How did they get there? Who took them to the US? How did they end up in someone's basement? How did they survive and not rot? The latter is possible although extremely unlikely, but that said most documents that have survived outside of archives survived accidentally - look at the Dead Sea Scrolls (yes, I know desert caves are not the same as the humid southern states) .
The biggest thing saying "fraud & fakery" is the lack of "Eyes on" of the actual texts. I know if I had them I would be happy to have them properly preserved and analyzed (whilst never leaving my sight either) and the fact this has not happened is my biggest concern.