well, just for the sake of argument, let us suspend our disbelief for just a moment (I know, it's tough, but just bear with me for a moment).
What if these are legitimate documents? To the vast majority of people, they would be worthless anyway. Martial arts training manuals have existed in China for a long time. In the early days they included drawings and short descriptions, and as technology developed they included photos. But you aren't going to learn any "secrets" from them. They were sort of cliff notes for something you already know and train. You cannot learn from them if you haven't already trained the material. They were not that "in-depth". They were rough outlines of the material, and nothing more.
You can go to Borders right now, go to the martial arts section, and there are at least a couple of reprints of old manuals on the shelves that you could pick up today. Sun Lu Tang's manual on Xing-I is in reprint. In fact, there is a book about Chinese training manuals. But unless you train in Xing-I, Sun Lu Tang's book won't do you much good, other than as an interesting historical document. You won't learn any secrets from it. And even if you do train Xing-i, you are much better off learning from your instructor, than from Sun's book.
So even if these are legitimate documents, they don't mean much today. They might be interesting for the sake of history, but I for one won't pay that kind of money for them. For that, I'm better off without them. If they were offered for a reasonable price like a legitimate book, and I didn't feel Chuck Mattera was just looking for a quick way to get wealthy off a pre-pubescent shaolin fantasy and the general public's ignorance of the topic, I might consider them. But not at this price, and not with this kind of marketing. It's a shame.