Here is the article from British and American Tanks of WWII that showed me the first pictures I had of Koala in action. ( Chamberlain and Ellis arms and Armour press 1969 ) . The name Koala was still quite visible when she was recovered. Platypus had most the top removed , however the front hatches and turret were still laying next to Koala when they were recovered.
The AWM folk provided some better shots of Koala and some of the NSW division that I have someplace .