The prototype Heron, VH-CJS, was still flying in Australia until 1976. It has been exposed to the weather in open storage ever since, but at least it hasn't been scrapped.
It is now stored at the RAAF Association's Aviation Heritage Museum, in the Perth suburb of Bull Creek. The wings were detached and placed under a small garage structure next to one of the museum's buildings (which contains the engines).
Here's some photos of the aircraft, including a couple that I took:
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Regards,
David