SGTF's Project A.P.E. micro coin is affixed to the inside of a locked container in the wilds of San Clemente Canyon. The tracking number, which is encrypted using SGTF's secret cipher, can be discovered at the Simian Guerrilla Task Force's Forbidden Zone (FBZ) A.P.E. 53 "Fallen Hollows" Top Secret Geocache (TSG).
Its discovery is worth 20 points towards an operative's rank on fbz.geocaches.org!