It doesn’t matter how many classified documents or boxes there are. Trump declassified them.
It’s possible Trump declassified them, but the transcript of the tape makes it sound like he didn’t think he had declassified the Milley document. So if Trump says he declassified them but the prosecution says he didn’t, and there is no record or witness to him declassifying them, how does he prove it? Does he just rely on the jurors believing him?