Buster,
A word of advice....... I would keep a tight lid on that fact. If they did remove the kits they broke the law. Once an airplane has been upgraded to Stage 3/Chapter 3 it is illegal in the USA and Europe to remove or downgrade them back to Stage 2/chapter 2 configuration. An A&P that knowingly removes any hushkit component in the USA that he knows is going to stay off the airplane can actually go to jail for it.
Regardless the fines are huge for doing it and you said they did it to 20 airplanes.???....
.......Now where is Guy Reedmans phone number again.....