I really normally wouldn't post this at all, but I at least want to give this to Octafish

[William Seger]

1. It's a 20-year-old story

... and even most JFK conspiracists who have looked into it don't buy it.

http://www.manuscriptservice.com/DPQ/filesv~1.htm

http://spot.acorn.net/jfkplace/03/MS/1-vr.html

The cartridge casing that was found was not manufactured before 1971:
http://www.manuscriptservice.com/Headstamp/#STATEMENT

In 2001, Bob Vernon was trying to sell the story to NBC, but they hired a private detective to check it out:

In brief, NBC retained me as a consultant for their planned story on Files. I hired the detective firm of Jules Kroll. JK established from telephone records Files was in Chicago, not Dallas, on November 22,1963. We then placed a call to Files from Dick Clark's office (DC was producer), and I interviewed Files about Kroll findings. He said he had a twin brother, who no one knew about, and whom he met shortly before November 22, and who he murdered after November 22. He said it was his twin brother in hospital with his wife, not him. His wife, however, said there was no twin, and Kroll confirmed there was no twin. My view then and now is that Files invented the story for the money it would earn him.