Other than covering the users head in aluminum foil the only indication your showing is a log file created which indicates the BB has been connected to a PC at some point. The time stamp should give you information on when. the numbers you have indicate it was in the morning.
The USB jack on the BB cannot wirelessly be connected so it must have been either in someone else's hands or the user left it un attended.
If the user is unable to watch for the guys in dark glasses I would suggest a wipe and reload of the users info.
Do a backup first. If anyone offers to help in dark glasses simply say no.