Coomera River is perfectly accessible to the ocean. Sanctuary Cove, Hope Harbour, Gold Coast City Marine could be possible places to keep it. Sanctuary Cove is accesible even by ferries and very large sail ships. Finally there's a boat ramp right next to the M1 bridge although the boat is definitely not stored at his house - at least haven't been since the media attention started. The boat is a "tinnie" (aluminium - albeit in the more expensive category of "tinnies"). Despite its size it's light enough to be loaded/unloaded by a single person.
I think the search in Nerang river was based solely on the location of Novy's car.
Bull sharks can be found in all of the canals and rivers on the Gold Coast. "shark bait" is also something that has crossed my mind - although I think remains could have been found had that happened in a river. Such a scenario would probably be more likely to be successful at open sea far from land.
