Welcome to the Sunshine State Geoart series. Each of the caches highlight a specific location in Florida. None of the caches are located at the coordinates listed on the cache pages. You will need to solve the puzzle below in order to obtain the correct coordinates.
All caches are soda bottle preforms containing only a log. You will need your own writing utensil or stamp (no stickers please). All caches are within 30’ of grassy or graded shell rock trails suitable for biking and hiking (unless noted otherwise). Please bring plenty of water and snacks.
Macclenny was originally called Darbyville because much of the land around the current Macclenny was owned by the Darby family. Carr Bowers McClenny married into the Darby family and bought most of the land; therefore, Darbyville became known as McClenny. It was renamed Macclenny, it is said, because the post office department had a rule against capital letters in the middle of a name.
What year was the first post office established? ABCD
N 26° 53.B77 W 080° 1A.68C

You can validate your puzzle solution with (coordinates) certitude.