Its entirely possible that your premise is correct. Think of a busy newsroom, usually an admin assistant will pack the documents before it is collected by the courier. The list of people at Fox who knew about the documents was more than one! However, Tucker only had copies of the documents but copies are easy to make tiny little changes to. Before l qualified as an attorney, l was working as a trainee on a big high court case, it was pretty nasty stuff. In court, counsel set up an overhead projector, he put up documents and showed where tiny gaps were, black lines that had a minuscule break in them, the documents had been altered. It collapsed the case. It would be possible for the documents that Tucker had, were already carrying certain marks inserted into the pages.