Some of the stuff SHOULD be sealed as it would reveal information about victims nobody needs to know. I'd guess some videos could be pornographic.
Maxwell was convicted mostly based on testimony by four females (as I vaguely recall) who are known. My guess if Maxwell had "trading material", she would have used it to get a lighter sentence, or something. The government would have raided her possessions of course. The amount of material collected would be voluminous.
The interesting thing, to me, is how Trump pushed this idea that the government is hiding stuff and now it's come around to bite him with his base. So, his base is confused.
I think most will forget this episode in a few weeks.