We heard one almost as soon as we entered the reserve and eventually saw a family of 3 feeding together and a pair flying overhead, and heard at least 2 more.
@MatthewFrawley I entered via a 'step around' on the road 250 metres past the access point falsely signified on google maps, which led to a obvious path that went to the main reserve gate.
Just note that while we were fairly confident it was public (see notes on other birder's list at https://ebird.org/australia/checklist/S152703955) and the track goes along a strip of land between the two private properties, street view shows the gate closed and the gap between it and the fence bolted.