The cache is not at the posted coordinates.
To find the location of this bonus cache, you will need to play the Lincoln Highway - Blair, NE into IOWA set of Adventure(Lab)caches and collect the codes. The Adventure Caches takes you along Lincoln Highway. The western most labs will contain the code words.
Upon completion of these western Adventure stages, you will need to remember a code word given in the journal.
Once you have all five code words, enter them in alphabetical order into the checker, all lower case with a hyphen (-) between them, no spaces, thus:
alpha-bravo-charlie-delta-echo
You can validate your puzzle solution with certitude.
To play the lab caches, download the Adventure Lab app to your phone.
Mobile app smart link
Use your phone's native QR code scanner to open this adventure in the Adventure Lab mobile app, or share the following URL:
https://adventurelab.page.link/b2k9
Placed By A Nebraskache Member