Well, not sure if this is the case now, but back in the days when I was at play, you were paired up by another person (even as I control a TOC/SCIF) I was paired up with another Captain or Major that oversee things, say I in charge of ground operation, he/she is in charge of air op.
Problem is, you can't really take picture unless you are out of sight of the other guy, unless the other guy is in on it, you probably can take a few when he was in the head or something, otherwise you won't be left alone for a long time to photograph 500+ documents. And again, that information is gathered as far as I understand as they belong in the same category, which means you need to go seek out those documents.
So it's literally impossible for him to get that many documents and that quick (There are possibility, but not really high) so either the other person have to be in on it, or he/she is also seriously neglectly discharging his/her duty.
I mean, if I am investigating, I wouldn't buy the Fortnite leak backstory. I don't think that is possible, or there is really a very extremely serious oversight in that airbase.