The cache is not at the posted coordinates.
To find the coords go on a trek up Tabletop mountain and complete the Adventure Lab "Tabletop Trek". This adventure lab will take you to the top of Tabletop mountain on the eastern side of the Toowoomba escarpment, 613m above sea level.
The hike is just under 2km return and is classified as a grade 5 walk with steep hills, cliff edges, loose rocks and some rock scrambling required. Please be careful and it is not advisable to climb Tabletop in the wet.
You can find the Ad lab here: https://adventurelab.page.link/ktek
There are great views to the Lockyer Valley and beyond so enjoy your trek!