Near the published coordinates, you will find a structure with a plaque attached. You will need some numbers from them to work out the cache coordinates.
In what year was the structure erected? Year = abcd?
How many windows does the structure have? Windows = e
How many letters in the first line of the plaque? Letters = f
Who erected the structure (one word)? Letters = g
How many letters in total in the 3rd and 4th words on the bottom line? Letters = h
The cache is hidden at S37° 18.0ef, E144° 58.cgh. You are looking for a PVC container, which is under cover but can be seen from just the right angle. As usual, please ensure the cache is well hidden again before you leave.
Have you visited the Geocaching Australia Forum?