The cache is not at the posted coordinates.
To find the location of this bonus cache, you will need to complete There is no place like Nebraska set of 5 Adventure(Lab)caches and collect the codes.
Upon completion of each Adventure stage, you will need to remember a code word, some given in the journal, some you will need to answer a question, for this Bonus Cache.
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.
There is some swag at the final location. The original items are Huskers, football and college type stuff, please try to trade similar stuff. There is room to leave some travel bugs, geocoin, pathtag, and post your Huskers picture. GO BIG RED. GO HUSKERS.