Just curious. What kinds of things are you asking Mac users to verify that they don't know where they are?
It usually revolves around network issues at my place. They have an image repository (mac based) and connect to the windows based file server.
Finding the IP for instance. Names of shared folders etc. The finder tool is not as informative for them as network neighborhood and its netbios convention. We do what we can to solve problems, but when I ask them to show me how they did it before they don’t know.
We had a laptop that could not join the wireless network which is encrypted. No clue on the part of the user. If it does not happen by itself, they don’t really know the OS to find things. They know their software part of their job, Quark for instance, but don’t know the machine.