On the 65-6's that Shelby tag was riveted over the vin on the driver side. On a 66, there was larger size nos. stamped on pass side apron. That was the real deal-for originality.
Sometime back, bought a 68 GT 350 that was missing engine, trans. Got the tags- door special vehicle tag, shelby tag, buck tag, in an envelope. W/s vin was in place never taken off. Body had been stripped for paint(two "partners" had a falling out"! MY gain
When I called SAAC and got a 68 person, first thing he asked, wanted the vin # on the apron/ same as vin on dash + they knew by no. that it was in the right time frame, etc. Sold the car and the next guy, am sure, registered it officially. Car brought up from Puerto Rico.
At that time, SAAC guy wanted pics of car, macro pic of vin on dash, apron rubbing and pic of it on car, screw hole in apron where buck tag had been plus pic of that AND rub! Pic of dash-which was mint and complete! Glad they were anal about it!