Dr. David Mantik has discovered that a "T" shape was scratched into the original left lateral x-ray of JFKs skull. However when this x-ray is viewed at NARA, there is no evidence of scratching around this letter "T". This is because the one at NARA is a copy of the original and therefore there would be no evidence of scratching on the copy, but only the original. In other words, the x-ray at NARA is a copy of the original, with the original no where in sight.
This is problematic because the HSCA said all these x-rays were originals.
Dr. Mantik talks about this at 1 hour in on this video: