I have found this passage regarding F.L. Blunt in “The 11th Batch” (documents released in 1996) edited by Joseph Backes, but it makes no reference to the post office building:
Document # 124-10027-10235 Is a 25 page document from Robert P. Gemberling to SAC, Dallas. It is dated January 1/27/65.
Actually there are only 6 pages here.
There is an index that lists the topics.
One is about an allegation by unknown caller to radio station KTUC, Tucson, Arizona, that a call was received at radio station KWKH, Shreveport, Louisiana, month before assassination stating President Kennedy would be murdered if he came to Texas.
Only the information from Fay Leon Blunt is here.
On December 1, 1964 Fay Leon Blunt, Dallas, Texas, phoned the FBI at Washington, D.C. stating that 17 individuals in the Hospital Ward of the 5th floor of the Dallas County Jail had witnessed the assassination of President Kennedy on November 22, 1963; however, Blunt stated that none of these witnesses have ever been interviewed.
The following investigation was conducted by Special Agent Richard J. Burnett.
On December 14, 1964 Sheriff Bill Decker, Dallas County Sheriffs Office, Dallas, Texas advised that thorough investigation was conducted at the Dallas County Jail immediately subsequent to the assassination and no witnesses to same were located among inmates.
Chief Jailer Ernest Lloyd Holman, Dallas County Jail, Dallas, Texas, on December 14, 1964, personally escorted Special Agent Richard J. Burnett through the hospital section of the County Jail on the fifth floor where white inmates with a mental history are confined. The mental inmates are kept in a large tank type cell which has one barred double window overlooking the scene of the assassination. The view from this window would have seen the President at the time of being struck by the assassin's bullets, but the window in the Texas School Book Depository from which the shots were fired is not visible from this cell area.
The hospital section for white prisoners on the fifth floor also has another large cell area in the northwest corner, which has west windows overlooking the site of the President's car at the time of the assassination, and another window on the north side of the building which overlooks the TSBD, including the window from which the shots were fired by the assassin.
However, Chief Jailer Holman advised that this large cell area is used only on weekends by persons serving their three-day sentences for "Driving While Intoxicated" charges and is not occupied until late on Friday nights as Texas law states any part of a day constitutes a full day's credit on drunk sentences. Thus, Holman noted that persons serving such "DWI" sentences report late on Friday's night to gain credit for one full day. Holman further advised that no "DWI" prisoners were in this cell at the time of the assassination.
It is noted that the north corner jail window (which overlooks the TSBD and the window of the TSBD from which assassin's window were fired) is very dirty and is backed by an iron mesh type grid guard. The view from this particular window is very distorted and it is believed by Holman to be impossible to identify anyone from this window, including the President in his car which would have been rounding the corner of Houston onto Elm Street approaching the Triple Underpass seconds before the shooting.
Both Sheriff Decker and Holman pointed out that anyone who would have been confined in the hospital section on the fifth floor of the jail at the time of the assassination would have been a mental case and the reliability of such a person would be highly questionable. Holman noted that it would be a most difficult and time consuming task at this late date to attempt to determine just who was confined in the Hospital Ward at the time of the assassination. Furthermore, Holman pointed out that such persons, if identified, have since been either released or sent to other State mental places of incarceration.
Holman and Chief Identification Officer James H. Kitching advised that Fay Leon Blunt (complainant in this matter) is well-known to them as a person completely unreliable who has been arrested on several occasions in the past on lunacy charges. Both stated they would place no confidence whatsoever in any information furnished by him. Kitching pulled Blunt's arrest record and noted that Blunt was not incarcerated in the Dallas county Jail at the time of the assassination.
http://spot.acorn.net/jfkplace/09/fp.back_...ue/arrb_11.html