Firstly, let's identify under who's authority these missing 77 images were systematically removed. We already know they cut the photographs of Sheila on the bed, and photographs that were taken of the gun cupboard contents, so somebody knows we are onto what they did with the bodies of the victims back at the scene before the bodies were staged by the cops and then photographed, as though the bodies of the two females in particular had been found where they ended up being photographed, but we all know that couldn't be true...
So far, we only have had evidence of 15 of the missing negatives / photographs, there's still another 62 that have been cut out of the negative strips...