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· Search 2026 [1/15/26]
· Agent Field Report [8/25/25]
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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 Leader
Geocaching Reference Number TB2JRFN

Worth 10 Points (Create an account to enter TB tracking number and earn points!)

 
POTAM Leader Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename LEADER) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at N 51° 17.097 E 000° 01.887 (GCTK7X), the former Project A.P.E. Mission 10b "Meridian Snake" Command Center in the UK.

About this item:
SGTF has obtained a critical piece of intelligence that needs special handling and care. We believe this media disk contains enemy correspondence, photographic surveillance and other important tactical data related to the 2001 Tim Burton film, Planet of the Apes. Per SGTF's AOR under Operation Silverback, operatives to help forward this classified item to the GCTK7X cache for further exploration have been initiated.

  
   
     

Operatives who have logged this TB...

  • Honorable Discharge CONDORMAN
    •  (Sun 21 Jun 2009 @ 19:02:11 BST; 1245607331 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DUCK432
    •  (Sat 18 Jul 2009 @ 7:08:34 BST; 1247897314 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • First Lieutenant TNE
    •  (Tue 28 Jul 2009 @ 8:12:07 BST; 1248765127 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Chief Warrant Office BRONCNUT
    •  (Tue 28 Jul 2009 @ 16:28:19 BST; 1248794899 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Sun 17 Mar 2024 @ 20:44:50 GMT; 1710708290 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Fri 20 Sep 2024 @ 18:13:35 BST; 1726852415 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Fri 20 Sep 2024 @ 19:17:41 BST; 1726856261 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Sat 21 Sep 2024 @ 21:20:57 BST; 1726950057 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Wed 25 Sep 2024 @ 10:12:20 BST; 1727255540 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Sat 08 Mar 2025 @ 22:16:40 GMT; 1741472200 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Sun 09 Mar 2025 @ 13:39:44 GMT; 1741527584 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge ROCKCHALK
    •  (Sun 09 Mar 2025 @ 22:11:18 GMT; 1741558278 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Mon 07 Jul 2025 @ 6:15:22 BST; 1751865322 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).