I remember that.
BIG embarassment for the RAAF - even BIGGER 'WIN' for the NAVY!!
From what I can recall, the aircraft did 'lazy circling patterns' over the city / suburbs until eventually reaching, and then crossing the coast, from whence it was safe to 'despatch'.
There was 'talk' at the time that the RAAF jets were too fast to 'get a bead' on the slow flying Auster....and because the armory was locked, there was a big time delay in getting the ammo...and prolly several other rumours at the time as well...
Happy days....