This cache is not at the posted coordinates. To find it, you will need to complete the nearby "Martinsville Uptown and More" Adventure Lab. Each correct answer at the stages of the Adventure Lab will provide you with information you need to locate the bonus cache.
N 36° 4A.BC3 W 079° 5D.E80
The cache is hidden not far from several of the Adventure Lab stages. You might say the container is large for a small or small for a regular.
Congratulations to Night-Hawk, FTF
Cnex urer.