Thanks for completing the Adventure Lab: Tweed Coast and I hoped you enjoyed your adventure along the creeks and head lands of our lovely area.
As with most mystery caches the cache is not at the listed co-ordinates but your first or last lab is a short drive away.
To calculate the final (GZ) cordinates for this cache you will need to complete Adventure Lab: Tweed Coast:
Link: https://adventurelab.page.link/tCSo
There is also an AL bonus cache near Fingal Heads that can be solved by doing the same AL.
GZ is at S 28 24.AAD E 153 33.E9E