Thank you for pointing out my error to me. I stand corrected. Regarding the question on the number of fragments in CE-842, you should be wary of using the poor quality photocopy for determining the number of fragments in that exhibit. I think that your yellow labelling has hidden the other two tiny fragments from view.

I discounted the other "fragment" for two reasons.
Firstly, the X-rays I posted show that two fragments have been removed from JBC's leg - a larger one and s small particle.
The two fragments Gregory testified to removing.
I assumed the fragments I labeled were these two fragments as the other "fragment" appears as just a straight line in the pic I was using:

But in the pic you posted it does appear as two separate things.
Which makes things even more baffling.
The FBI report states that Gregory only removed one fragment.
Frazier labels Q9 as a single fragment and states in his WC testimony Q9 is a single fragment.
When Frazier found three small fragments on the limo floor he labeled them as three fragments, not a single fragment. Why would he list four fragments from JBC's arm as a single fragment?
Gregory testifies that he removed two fragments.
The X-rays show he removed two fragments.
Audrey Bell states she received "perhaps 4" fragments.
The picture in the National Archives shows four fragments.
WTF is going on??