I had the closest call I've ever had last year with an aircraft overflying the airfield at circuit height. I was climbing to circuit height after a touch and go and dipped the nose getting ready to turn downwind and there was the aircraft. No radio calls, nothing. RAAUS didn't do anything and I did some research and found which aircraft it was, told RAAUS and they forwarded it to CASA and still have heard nothing.
It could have been a training flight but if something was done, maybe that person would know in the future just how close I was to making the news.