> If this is disinformation, the FBI, which has ostensibly been in possession of the documents for several months, has every incentive to comment on it, as does the CIA.

This is ridiculously wrong. The FBI and CIA and every other government agency absolutely do not want to comment on something like this, because it just pulls them into this political bullshit. This is exactly the "official" reason James Comey was fired, for an almost identical issue, almost exactly 4 years ago. It is a near 100% certainty that any FBI or CIA official commenting on this issue now will be fired a few months from now.