Assange has never authenticated any of these documents. He won't even say where they came from. It is said that his partner in this operation is Putin and I don't trust him, either. He's KGB and wouldn't think twice about altering documents or creating false ones. The man is a homicidal crook. It is pretty much a certainty that anyone who cuddles up to Putin and Assange will get burned in the end. Neither one of them can be trusted.
I have been hoping that Trump will create and maintain a great deal of distance between himself and Putin. I am happy to see that he has lately been distancing himself.