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  Journal Entries  
 
· Search 2026 [1/15/26]
· Agent Field Report [8/25/25]
· FBZ 54 Revisited [7/8/25]

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  Silverback Cipher  
 
Silverback hunters should be familiar with the “pigpen” or masonic cipher, which is a simple substitution cipher exchanging letters for symbols based on a grid.

This cipher can be used to decrypt directions and secret codewords at FBZ geocaches!

  External Links  
  · 1: The CIA Vault
· 2: The FBI Vault
· 3: Project Blue Book
· 4: Aliens the Truth
· 5: The Black Vault

 << SGTF Special Operations
POTAM Sasquatch
Geocaching Reference Number TB3Y15Q

Worth 20 Points (Create an account to enter TB tracking number and earn points!)

 
POTAM Sasquatch Tracking Bug Image
Current GOAL:
Operatives can discover this high-value intelligence (codename SASQUATCH) as part of the FBZ 54 Rock River Burial Mound Operation Silverback mission.

Its discovery is worth 20 points towards an operative's rank on this Web site!


About This Item:
An archival photograph of Gigantopithecus is provided in the appendix of our report presented at the FBZ A.P.E. 54 cache in San Rock Canyon.

PLEASE DO NOT REMOVE THIS INTEL FROM THE A.P.E. 54 CACHE! DISCOVERY ONLY!
  
   
     

Operatives who have logged this TB...

  • Warrant Officer One CCC
    •  (Mon 25 Jan 2016 @ 14:28:05 GMT; 1453732085 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Staff Sergeant ELANASTAHL
    •  (Mon 07 Aug 2017 @ 10:27:09 BST; 1502098029 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Sergeant Major HDAGENAIS
    •  (Mon 07 Aug 2017 @ 10:42:37 BST; 1502098957 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Thu 25 Apr 2024 @ 20:42:42 BST; 1714074162 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Sun 19 May 2024 @ 15:06:21 BST; 1716127581 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Sun 19 May 2024 @ 21:43:35 BST; 1716151415 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Wed 12 Jun 2024 @ 13:06:26 BST; 1718193986 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Thu 20 Jun 2024 @ 5:21:15 BST; 1718857275 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge ROCKCHALK
    •  (Sat 08 Mar 2025 @ 19:41:39 GMT; 1741462899 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Sun 16 Mar 2025 @ 21:17:43 GMT; 1742159863 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Mon 17 Mar 2025 @ 12:33:51 GMT; 1742214831 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Mon 07 Jul 2025 @ 17:34:57 BST; 1751906097 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Major TURTLEX
    •  (Tue 31 Mar 2026 @ 17:36:57 BST; 1774975017 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
   

 


*Disclaimer: Stories here and at FBZ caches are a combination of historical conjecture, anecdote and pure fiction. Any similarity to any event, group, or person living or dead is merely coincidental. Additionally, SGTF has utilized a variety of signs/stickers as props in the FBZ geocaching series. Labels or warnings (e.g. biohazard, radioactive, etc.) which are fictitious will display some form of the SGTF/Silverback moniker; all other warning signage encountered during this or any other FBZ adventure should be respected and observed as posted.


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   Operation Silverback Prize Ring SILVERBACK Prize Rings

Those who create an account on fbz.geocaches.org and enter mission codewords and POTAM tracking bug numbers receive points towards an Operative ranking. Operatives who achieve the rank of General (700 points) are eligible to receive an official silver Operation Silverback GC.com trackable ring from Oakcoins. Gold rings are available for those who reach the rank of Green Beret (or higher).