Tony Fisher owned 2 Mustangs, he sold one to a fellow who killed himself in it at the opening of an airstrip in Victoria - low level, high bank angle, decreasing airspeed - stalled and spun. The other one, the one I saw at Jerilderie, is I think VH-BOB now.
Tony had a number of properties, including one near Mt Isa and it was thought that he may have had one of the Mustangs there for a time. It may, or may not, have been the aircraft that formatted on the DCA F-27 flying between Alice Springs and Tennant Creek that has at times been cited as a Spitfire.