Being offensive is the privacy line?

I prefer the don't trust anything on your work machines or work equipment to be private, especially if it's synced with a server or directly from a server.

If it was his individual laptop or something it might be slightly different but the etc directory was remotely accessible and his password clearly matters to the company's security. Like a rented apartment a heads up beforehand might be a good courtesy not a requirement though.

Most of what I do in the restroom is offensive. All the rest is more like an atrocity. I'd still prefer not to be filmed.