Roscoe White and the DPD were behind the BYPs and Roscoe was no stranger to darkroom shenanigans. The BYPs were part of Oswald's sheep-dipping and the DPD's aim was to leak a photo showing Oswald with the alleged murder weapons and commie lit. The reason the scope was left on the rifle was to match the BYPs, otherwise, it was more than useless to an assassin. Also note that only CE 133A was good enough quality to read the font on the commie lit.
The DPD have so many incriminating connections to the BYPs it's just more Keystone Cops from them. From their backyard "re-enactments" to their darkroom cutouts from a negative that appeared out of no where and was never admitted into evidence. This one stinks from the way the DPD collected the evidence to the eventual leaked photo CE 133A that landed on the front page of Life.
CE 133A is the smoking gun. Its quality does not match the other photos. It's too good and was NOT taken with CE 750, the Imperial Reflex 620 camera. CE 133A does not have the same lens distortion as the other photos, in particular the "spherical aberration" of CE 133A does not match the other photos. Spherical aberration occurs outside the "sweet spot" of the lens where the image is in focus and there is minimal distortion. Good lenses have minimal spherical aberration and CE 133A was taken with a good lens. CE 133A was obviously the "money shot" and not taken with the Imperial Reflex camera. CE 133A was taken shortly before CE 133C but with a better quality camera, perhaps the Minox spy camera that was found among Oswald's possessions.
For example, the following blended GIF shows a comparison of CE 133A and C. I tried to match up the background as best I could but spherical aberration got in the way and stood out like a sore thumb. Note that the differences in distortion between these 2 photos were NOT caused by a simple tilt of the camera.