The cache is not at the above coordinates
As geocachers, we rely on numbers for our hobby to work. To obtain the numbers needed to find this cache, you will need to avail yourself of the services of an organisation that specialises in supplying numbers - indeed, then Treasurer Paul Keating once described some of them as "a beautiful set of numbers". This organisation celebrated it's centenary in 2005, and has a world-wide reputation as one of the best agencies in the world in it's field.
The cache has been catalogued at:
S 35 1Children, Australia: A Social Report, 1999; E 149 0National Health Survey: Use of Medications, Australia, 1995.
I'm sure you can work out where the decimal points go.
Even if the starting location is closed, you can still search for the answers. The cache itself is available 24/7. The GZ is within comfortable walking distance (<1km) of the home of the organisation which supplies Australia with such beautiful numbers. Log only, please BYO pen.
You might want to visit this purveyor of fine figures again in June 2007, when results will be available from the national Census held in August 2006.