I had a near miss some 8 months ago. 20ft below me, opposite direction, through a CTAF at circuit height, close to Melbourne.
I obtained the rego and track from FlightAware and which clearly showed what happened and sent it to the ATSB. My friend was not far behind and he probably only avoided a midair because I quickly warned him. He also logged it with them.
I got nothing back from the ATSB. My friend called for an update and was advised that it was all about priorities and this wasn’t a priority.
Our own private investigations revealed that the pilot is well into his 90’s and has a history of this kind of flying behaviour and lack of radio use.
All it would have taken was a quick call to CASA to follow up with the pilot for a please explain and the potential to save lives in the future. But... nothing but crickets...