However, we do have witness evidence from Boswell to the ARRB in 1996 that he saw something like this, at least in the process of taking some of the photographs.
Q. With respect to the photographs, was anything done to the skull or to the hair to prepare it for the photographs? For example, was the hair cleaned at all? Was the hair parted in any way or any skull fragments put in before the photographs were taken?
A. Well, photographs were taken at various stages. The scalp was pulled forward in order to demonstrate the wound of entrance. And then the scalp was reflected to show the magnitude of the wound and more or less the direction of the bullet, and then to remove the brain.
Q. Just so I'm clear--and we'll be looking at the photographs in a few minutes, and you can maybe clarify it there. But at least with some of the photographs, is it your testimony that the scalp was pulled in a way different from how it was when you first saw it in order to better illustrate either wound of entry or exit?
A. Yes. The scalp was essentially loose. In the usual autopsy, you have to cut underneath the scalp in order to reflect it. In this case, the scalp was mobile so that you could pull it forward to obscure the wound or pull it back to make the wound completely lucid.
Q. Okay. Was the hair cleaned in any way for purposes of the photographs?
A. No, I don't think so. There was not a lot of blood, as I remember, and I think he had been pretty well cleaned up in the operating--in the emergency room. And I don't think we had to do much in the way of cleansing before we took photographs.
...
A. There was a big wound sort of transverse up like this from left posterior to right anterior. The scalp was separated, but it was folded over, and you could fold the scalp over and almost hide the wound.
When you lifted the scalp up, you could really lay it back posteriorally, and there was a lot of bone still attached to the scalp but detached from the remainder of the skull. And I think these parts back here probably reflect that.
http://aarclibrary.org/publib/jfk/arrb/medical_testimony/pdf/Boswell_2-26-96.pdf