You may have answered the question yourself inadvertently...
There's still a couple on the Australian register
What happened to the rest ???
Two left in OZ, one hasn't flown for years and I don't know about the other one.
Wait and see what happens when one of the most *dangerous* aircraft in the world end up on a charter AOC.
The Mitsubishi MU-2 is one of post-war Japan's most successful aircraft. There have been 330 fatalities from MU-2 crashes. 704 were built.
As a mate who has over 500 hours on them said to me a while back, they are a "great freight aircraft."