Yes, I know what the law is. In practical reality they only use this for inspecting commercial broadcast sites and things like large cellular rooftop sector sites.

I'd be very interested in seeing anyone that can provide an real world example of FCC staff on their own, not tagging along with other law enforcement agencies entering onto private residential properties (like a house) to conduct their own search. I work professionally in two way radio systems and have never heard of this happening. The FCC does not execute its own search warrants.