..... because the park/area is part of Townsville's V8 track
..... because the "sculpture" at GZ is dedicated to race cars
..... because it's an easy find
..... because you need to be quick to retrieve it to avoid being seen by the passing muggles
You are looking for a smallish container (bigger than a micro, but not quite a small), it can hold geocoins and small trackables.
Have Fun 