The cache is not at the posted coordinates..
IF YOU WOULD LIKE TO LOG THIS BONUS CACHE, FIRST DO THE ADVENTURE LAB CACHE, "JEFFREYS BAY... SURFING MECCA", AND FIND THE COORDINATES IN THE FIFTH JOURNAL.
As this can be a very busy area, you have to be extra careful when retrieving and replacing the cache. Use stealth mode...
PLEASE REPLACE THE CACHE EXACTLY AS YOU FOUND IT. BYOP.