This geocache is not at the posted coordinates.
It is a bonus cache for completing all five stations of the Adventure Lab:
Start the Adventure Lab by opening the official Adventure Lab app or via the QR code below.
The app will guide you through a short walk along Palmer street and the different questions at the several stations. In the completion messages of each Adventure Lab station you will be provided with one of the required numbers for this bonus cache. Should you have already completed the Adventure Lab cache before this bonus cache was published, you will be able to find the required information by opening once again the Adventure Lab in the official app and then clicking on "View 5 Journal entries".
The cache can be found at
S 19° 15.ABC E 146° 49.DEF
Once you collected all numbers, feel free to check your coordinates in the provided checker below.
Enjoy your walk and please be stealthy when getting the cache to keep it alive.
(Historic images from the archives of citylibraries)