Many years ago now, inspectors were being flown around a certain GA-heavy region with lots of airstrips on islands in a fairly compact area, in a heli and a fixed wing aircraft, and local legend has it these chariots been directed by the inspectors not to make radio calls, somewhat of a covert operation.
Well, we figured it out relatively quickly. One of the local flyers may or may not have “shadowed” one of these aircraft, may or may not have made transmissions on their behalf with the words “carrying .... inspectors for ramp checks.”
Everyone ended up keeping each other up to date on their whereabouts.
The inspectors were not appreciative of that.
They were fun times!