The cache is not at the published co-ordinates. It is not a field puzzle.
Outplay, outhide, outside
After my unsuccessful attempt to conquer the galaxy at Marr Playground, I instead turned my mind to things local. I would become instead the Grand Master of the Society for the Prevention of Geocaches. I would wage war on all my opponents and they would stand in awe as I raised my rinsemesocks banner over them. I would survive.
One by one, I found the secret list of the members that I had to eliminate. I memorised it because I couldn't let there be a record of what I had done. I worked through the list one by one. I concentrated on the weakest ones to attack first. Sometimes I succeeded, sometimes I didn't. I sometimes enjoyed the explosion of chaos once I revealed my move against them, those poor saps .One by one they fell. Mostly by force, sometimes by deception, and sometimes I just bluffed. With each move, I inched closer and close to the top. I would attain that number one rank .
The people I eliminated were:
Samuel Michael Byrne (born 1883)
Richard Hooper (born 1846)
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Lieutenant Charles Browne Hardwicke, (born 1788)
Frank Pryke, (born 1872)
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Major John Ovens (born 1788)
Major Roland Ravenscroft Wettenhall (born 1882)
General Sir Thomas Albert Blamey (born 1884)
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Peter O'Neil (born 1757)
Lieutenant William George Carlile Kent (1788)
Maurice Margarot (born 1745)
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General William Riddell Birdwood, later Baron Birdwood (born 1865)
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Captain James Cook (born 1728)
Colonel Robert Torrens (born 1780)
General Sir John Monash (born 1865)
.
All names are from the Australian Dictionary of Biography.

Image by Fibonacci - Own work, CC BY-SA 3.0, Link