When we had the regional restrictions here in WA, Airservices at Jandakot had to tell POLAIR of any flights arriving that hadn't left Jandakot that day. They would ask where you had come from and I understand that the police would then have a chat to the pilot, though one of ours with a G2G pass from another region wasn't questioned. (We cancelled nav training for the duration)
But it they go between uncontrolled aerodromes or don't file a flight plan, nobody would ever know. I just hope they stay TF away from WA, WAxit is working out very nicely for us.