The posted coordinates are one of the places on the Adventure Lab: Omarama: Place of Light.
You will need to download and use the official Adventure Lab app to visit 5 locations in Omarama which will take you less than half an hour by bike, or under an hour on foot. You will need to answer all five of the questions to obtain the final coords for this bonus, which is a small container, not visible from any distance. Please take your own pen.
The final coordinates are : S 44º 29. abc E 169º 58. def
https://adventurelab.page.link/ELJv