CACHE IS NOT AT THE POSTED COORDINATES
Posted coords will not help you solve the puzzle.
You will need to upload the Adventure Lap app in your smartphone.
Then you will look for the Adventure Lab named
https://adventurelab.page.link/WvX8
When you have gathered all 5 of the bonus words from the
Fremont History Niles-Centerville Adventure Lab
put the words in alphabetical order for the keyword answer in the checker

You can validate your puzzle solution with certitude.