I have the same access to the same files (not that I’d ever look... especially now that I know they have alarms!) and there’s just not much to look at. All that’s there is basic personal information, nothing sexy like travel itineraries and such. Certainly nothing worth losing one’s job over.
Sounds to me like a case of employees with an overactive sense of curiosity and way too much time on their hands. I believe those that are trying to find a personal and/or political agenda here are going to be disappointed.
The files contain the sort of information needed to set up credit cards ~ that might well have been underway ~ never concede that every surreptitious entry has something to do with espionage or politics ~ sometimes it’s little more than simple theft!