10/14/63 cable from Mexico City to Director: "HBFINCH General Services office advises shipment leaving Mexi this week."
10/21/63 cable from Director to Mexico City quoting the above cable: "Embassy General Services office advises shipment leaving Mexi this week."
This document regards ongoing new construction of new United States Embassy offices were feasibly next to the CIA's Mexico City Station. It refers to discussing preparations with ODACID (US Department of State) and the particular security and building requirements. The messaging official states, "Station (Mexico City) concurs with changes but desires a vault door installed in common wall bio file room No 507 and Conference Room No 508 which is sound proofed and opened only from Station Side." It suggests the Mexico City Station and US Embassy were adjoining structures and this is consistent with the habit of nations using their diplomatic ranks to conceal intelligence agents.
This piece of evidence discusses intelligence data on Yugoslavian nationals present inside Mexico in connection with the visit of a visiting Communist leader named Josep Broz Tito. To obtain the local information before CIA suggests that the US Embassy discussed was nearby and sent from HBFINCH (US Mexico City Embassy).
Research Aid: Cryptonyms and Terms in Declassified CIA Files Nazi War Crimes and Japanese Imperial Government Records Disclosure Acts: https://www.archives.gov/files/iwg/declassified-records/rg-263-cia-records/second-release-lexicon.pdf
HBFiNCH is defined as "US Embassy".