Bro, I did computer repair for 10 years, I have seen everything from grandma deep throating her mailman to apparently non-illegal horse stuff.

NOT ONCE was I looking for it. Some people's desktops are just fucking wild, holy shit.

The point of this, is that most/all techs are basically so busy with their quotas, that they dont have time to go snooping for really anything, unless that snooping is directly related to what they're doing. So, I wouldnt worry about it.