Oswald in the doorway: the blog of the Oswald Innocence Campaign, by Ralph Cinque

Backes says that the two FBI letter/documents have to be counted as just one. Well, let's compare them. 

The first and shorter was signed (with printed names and handwritten initials) at the bottom by Special Agents Robert Gemberling and Emory Horton and dated February 29, 1964 for when it was dictated, presumably, to a stenographer, although there is a second date of March 2, 1964 at the top, presumably for when it was typed.  

The second and longer was dated March 3, 1964 and was neither signed nor was it attributed to anyone.  

The first and shorter not titled. The second and longer was titled: 

The Assassination of President John Fitzgerald Kennedy, November 22, 1963, Dallas Texas

The first and shorter consisted of the following: 

an account of what Lovelady said at his 2/29/63 appointment with the FBI in Dallas.

The second and longer consisted of the following:

an account of how the Altgens photo was brought to the attention of the FBI, starting with the role of Mike Shapiro, manager of WFAA Television in Dallas. It included the disposition of the Altgens photo by wire, where it was sent, etc. It then covered the November 25th testimony of Roy Truly concerning the identity of the man in the doorway. It then covered the November 25th testimony of Billy Lovelady to the FBI concerning the same. Next was covered a January 11th letter to the FBI from JD Royce concerning his conviction that the disputed figure was Oswald. Next came a very long section concerning the letter the Secret Service received from Helen Shirah, including the entire letter, expressing her adamant belief that the disputed figure was Oswald. That was followed by an account of her January 30 interview with the FBI in Florida concerning her letter to the Secret Service. That was followed by an account of a FBI interview with William Shelley in Dallas that was also conducted on January 30. Then came an account of Lovelady's 2/29/64 interview and photo session with the FBI in Dallas which essentially paralleled the letter signed by Gemberling and Horton. However, the vital statistics reported were enhanced compared to the first letter, as they included additional elements: Lovelady's weight, a description of his hair, a description of his eyes, his build, and his complexion. Finally, it provided other information not included in the shorter letter, such as his home address, the fact that he didn't have a telephone, his wife's name, and more complete information about his children, which consisted of two step-children and a biological daughter.   

The shorter letter consisted of one page, while the longer one consisted of six pages, yet, Joseph Backes says that we must consider them as one and the same document, as one piece of evidence, as one entity. Why? It's because he is trying to deny that the FBI put it in writing twice that Lovelady stated that he wore a red and white vertical striped shirt and blue jeans on November 22 1963, which he did.