See, I can't help but wonder how, if something is genuinely "missed out", how it was ever thought to have there in the first place. Makes it very easy for anyone to jump in and say "Aha, XY and Z are missing". If they've never been seen, how do they know? 'Course, I do realize that there are enough fake docs here to paper a lavatory with.
It's quite clear that you've been blinkered while half-heartedly following the case because you'd also have gathered that a number of documents/files are still in existence but hidden away. So this means, to me, that they were already there to begin with, even if it makes no sense in your world.
It's the genuine docs which are hidden from view. Those which make up the missing pieces of the unfinished jig-saw which spell the difference between JB's guilt/innocence.
Don't you imagine that because he'd been found guilty that every page would have been thrown at him and that PII would be empty of every last thing pertaining to this case ?