Most NoMAD users are pushing preferences via configuration profiles. This is a great thing, but does make troubleshooting a bit tougher as the defaults command won’t show what keys are forced.
So… have a look at pref-finder.
Launch the tool and specify a preference domain you want to look at. You’ll be able to see all of the keys for that domain, check just a single key, check if a key is forced, or what most people will use it for, show all forced keys for a particular domain.
pref-finder -d com.trusourcelabs.NoMAD -k LastUser -f -F -a
It has a project page, and can be downloaded here.