Thomas Jones

[Laurie Verge]

Also, Jones had been clever enough to talk his way past the Feds throughout the war. I believe I'm correct that he said under questioning, "You are arresting me because someone stole my boat?" The Feds had no other evidence to refute that, and Jones didn't come clean until years later.

If you notice, the Feds seemed to lose interest in people who assisted the fugitives after the assassination - except for Dr. Mudd, which would indicate to me that they had enough information to tie him to the original conspiracy.