The cache is not at the posted coordinates but is less than 2 miles away
I obtained a Geocache waypoint (GC#) on February 12, 2012 for a cache that was not published. Find the name of the unpublished cache and you will find the coordinates for this cache.
The waypoint starts with GC3C and contains 2 additional letters and 1 additional number. Per GC.com Base 31 implementation, the letters ILOSU (US OIL or LOUIS) are not used.
Although not as easily as originally intended, after the 21-August-13 Geocaching.com site update, this puzzle is "once again solvable by everyone". If you don't know how to find the title of an unpublished cache, I suggest that you solve GC4KK4E first.
Thanks to Chrysalides for planting the seed ;)
There is room for very small trade and signature items. Don't forget to bring your pen.
You can validate your puzzle solution with Certitude.
Congratulations to TeamOttlet on FTS and FTF.