Not sure how significant these files will be given that the investigation of the RFK assassination was mostly handled by the LAPD.
While Sirhan Sirhan was apprehended at the scene of the crime with a gun in his hand, the Medical Examiner refused to conclude that Sirhan killed RFK because he was never in a position to shoot him at point-blank range from behind. That and other issues with the forensic evidence is why this is not as open and shut a case as it seems.
'Did L.A. police and prosecutors bungle the Bobby Kennedy assassination?' -
https://www.mercurynews.com/2018/06/05/did-l-a-police-and-prosecutors-bungle-the-bobby-kennedy-assassination/"Noguchi found that four shots had been fired at Kennedy from at most three inches away. Three shots appeared to be in contact with Kennedy’s back and shoulder, based on powder burns to his jacket, Noguchi said, with one shot passing through the jacket’s shoulder pad and not touching Kennedy. All three were fired sharply upward. The fourth shot was fired into the back of Kennedy’s head from three inches away, Noguchi concluded, by test-firing a similar gun to determine how much gunpowder sprayed at various distances.
“Thus I have never said,” Noguchi wrote in his autobiography, “that Sirhan Sirhan killed Robert Kennedy.” At a conference last month of RFK assassination authors, Pittsburgh coroner Cyril Wecht pressed Noguchi as to whether there was a second gunman, but the 91-year-old pathologist said, “That’s not my duty.” He also told Wecht that defense attorneys never spoke with him before the trial and did not ask him about the muzzle distance at trial."
