I see what I thought might be an outline of slightly different density, but even if I was correct it would be totally unconvincing. I also find it unbelievable. I guess you are speechless.

I 'flipped' the first two scans (which are actually the ones Allan calls 4 & 5) as it looks like the good Doctor laid them on his scanner face up. Look at the original scans and see if you see the lighter circular areas where I indicated before.

To repeat myself - Im probably wrong but if Im right its unconvincing.