One of the purposes of the Beverly Oliver ruse may have been to set up a false set of custody for the Babushka camera.
First, Beverly said she was using a movie camera when we know Babushka Lady took still pictures. As Denis M. pointed out, this appears to be a Sears box camera, which was a still camera, not a movie camera.
Second, Beverly claims to have been in possession of the camera and film until the FBI magically found her and took them away. This lie was pernicious because it mislead researchers and prevented them, for decades, from putting 2 and 2 together to realize that Babushka Lady had taken the Moorman photo.