Time travel in Beit Shean - Bonus round Mystery Cache

The cache is not located at the posted coordinates!

To find it, you'll need to complete all five stages of the cache Time travel in Beit Shean. At the
end of each stage, you'll receive one letter. Once you have all five letters, try to form the
correct word and enter it into the checker. Don't worry! there aren't too many words that can
be formed from these five letters.

You can validate your puzzle solution with certitude.