Even now, CCTVs couldn't function yet as the main security system of the building still needed to be fixed. And they took advantage of it by waltzing inside the Instructor's office.
The Instructor's Office holds a communicator whose sole purpose is to connect with the other Marshals and members of the military base that holds power.
This communicator is different from theirs. It has a storage function that lets any past conversation exchange between participants be recorded.
If they get their hands on it, they should know what the instructors figured out.
Waltzing towards the Instructor's Office was easy enough. Because this corridor leads to their office, there's barely any army personnel around.
Alice easily swiped the ID card, and the door unlocked. The three of them went inside and directly checked the communicator.