Some of the pits guys are pretty cluey.
we used to service a charade 3cyl turbo. Nice car.
it ran out of registration and the owner took it to the pits.
the inspector noticed something odd about the firewall atound the comp plate. And he got a hammer ana screw driver and started bashing it ( lucky he was correct !!!) And it had a fake firewall section. So the car was taken by forensics and they ended up catching the guy that did it, as there was a finger print on the backside if the fire wall plate !.
Was a nice lil car too.