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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 Frenzy
Geocaching Reference Number TB2T4MR

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

 
POTAM Frenzy Tracking Bug ImageCurrent GOAL:
Your TOP SECRET mission (codename FRENZY) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at (GC210M6), The Forbidden Zone FBZ A.P.E. 57 in San Diego, CA. U.S.A.

About this item:
SGTF speculates this trading card is an archival item referencing the original Planet of the Apes movie series. Per SGTF's AOR under Operation Silverback, operatives to forward this materials item to FBZ A.P.E. 57.

Please do not keep this TB if you DO mistakenly remove it from the Project APE cache. Drop it in a cache somewhere for another person to find and perhaps the mission will be completed again!
  
   
     

Operatives who have logged this TB...

  • Honorable Discharge CONDORMAN
    •  (Wed 11 Nov 2009 @ 9:22:12 GMT; 1257931332 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DUCK432
    •  (Tue 08 Dec 2009 @ 23:37:17 GMT; 1260315437 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE6X6
    •  (Fri 30 Apr 2010 @ 16:25:44 BST; 1272641144 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
    •  (Fri 30 Apr 2010 @ 16:55:50 BST; 1272642950 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Sun 17 Mar 2024 @ 20:50:15 GMT; 1710708615 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Fri 20 Sep 2024 @ 18:11:40 BST; 1726852300 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Fri 20 Sep 2024 @ 19:12:04 BST; 1726855924 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Sat 21 Sep 2024 @ 21:05:49 BST; 1726949149 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Wed 25 Sep 2024 @ 10:04:30 BST; 1727255070 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Sat 08 Mar 2025 @ 22:03:48 GMT; 1741471428 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Sun 09 Mar 2025 @ 13:43:57 GMT; 1741527837 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge ROCKCHALK
    •  (Sun 09 Mar 2025 @ 22:10:17 GMT; 1741558217 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Sat 26 Jul 2025 @ 18:58:19 BST; 1753552699 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).