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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 General
Geocaching Reference Number TB29NXD

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

 
POTAM General Tracking Bug ImageCurrent Goal:
Your TOP SECRET mission (codename General) is to further this Special Reconnaissance (SR) evidence through any means possible to help it reach its destination at S 24° 15.967 W 048° 25.299 (GCC67), the "Project A.P.E." Mission 4 Southern Bowl Command Center.

About this item:
SGTF speculates this is a "long lost" trading card from the 2001 Tim Burton film, Planet of the Apes. Per SGTF's AOR under "Operation Silverback," operatives to help forward this materials item to the M-04 SB cache for further exploration have been initiated.
  
   
     

Operatives who have logged this TB...

  • Honorable Discharge DUCK432
    •  (Wed 11 Mar 2009 @ 22:27:07 GMT; 1236810427 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge CONDORMAN
    •  (Wed 11 Mar 2009 @ 23:24:07 GMT; 1236813847 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • First Lieutenant TNE
    •  (Sat 25 Jul 2009 @ 18:30:11 BST; 1248543011 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Chief Warrant Office BRONCNUT
    •  (Sun 26 Jul 2009 @ 16:45:11 BST; 1248623111 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge THEJJDUO
    •  (Tue 05 Jan 2010 @ 17:29:16 GMT; 1262712556 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge FLAGMAN
    •  (Sun 23 Jul 2023 @ 18:42:05 BST; 1690134125 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge DICKANDALE
    •  (Sat 09 Mar 2024 @ 18:26:00 GMT; 1710008760 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MAGICN3
    •  (Fri 20 Sep 2024 @ 18:07:09 BST; 1726852029 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MPARK65
    •  (Fri 20 Sep 2024 @ 19:25:48 BST; 1726856748 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Green Beret FEBONIOCLAN
    •  (Sun 22 Sep 2024 @ 10:30:50 BST; 1726997450 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge MIKE2FIND
    •  (Wed 25 Sep 2024 @ 10:29:35 BST; 1727256575 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge BROTHERSELDOM
    •  (Sat 08 Mar 2025 @ 21:39:11 GMT; 1741469951 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Honorable Discharge TREKKERDMC
    •  (Sun 09 Mar 2025 @ 12:57:24 GMT; 1741525044 seconds since Unix Epoch (POSIX) 01 Jan 1970 00:00:00 UTC)
  • Warrant Officer One LAMIEKINS
    •  (Sun 20 Apr 2025 @ 20:16:58 BST; 1745176618 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).