There’s old reason too.
They were kept in the open on a stage at MaL. They were kept in an unlocked bathroom next to a copier at MaL. They were repeatedly moved around to prevent the FBI from finding them, she the FBI didn’t even search every place they were supposed to search.
Of course there are still documents he’s kept, and he surely has xeroxes or photographs of everything that was “recovered”.
He ate papers he has been intentionally obscuring the information he’s had access to the entire time that he’s been receiving privileged information.
Why is it that my company keeps better track of random USB drives than the federal government does of classified documents?
For real, it’s probably because some classified docs can’t be tracked in an auditable format because the auditors would not have clearance to know those documents exist or any other info about them.