As with most mystery caches the cache is not at the listed coordinates. They are the starting coordinates for the Great Southern Road Breadalbane to Gunning Adventure Lab.
To calculate the GZ coordinates for this cache you will first need to compleate the Adventure Lab.
There is also an AL bonus cache in Gunning that can be solved by doing the same AL cache.
https://labs.geocaching.com/goto/GSR
GZ is at S34 FH.BFK, E149 CI.CIA