not meaning to stereotype, but I know at least 3 leb workshops in syd that can give you a pink slip for the right price without even looking at the car.
that said, if I turned around and sold a car with their dodgy roady, and they got caught out for it, they'd come see me personally with baseball bats.
Try tellin the bloke you bought it off that you're gonna dob in the workshop, most times he'll be good mates with the guy who issued the roady, and if the workshop doesn't wanna lose their license to issue roady's and a hefty fine, then they'll convince the guy who sold you the car to offer a full refund. if you get what I mean.