I will assume you mean the R32's post Bathurst?
I may be a newbie to this forum, but been involved in cars all my life.
Racing and working, factory teams & dealerships...
Ferrari did something similar, and MG did also. (when I worked for them)
Bring in cars for homologation/racing/evaluation purposes. in my experience these vehicles returned to the factory, and were crushed, after usable parts were removed, as they were aften 'bastard children' with a mix and match of parts, and often non compliant to the relevant design regs of the countries thay went to originaly.
i do know of a few instances where these cars were used for further developement studies back at the factory ie; component testing.
hope that helps.