Obviously Marina had to take them because Oswald wasn't really close to other people who would have taken them for him.
Still wondering why it is so obvious. When demonstrating to Robert Blakey and the HSCA panel.. how she had used the camera ...she held it upside down. She couldn't state at first whether she took more than one picture...no one could explain how a 3rd B Y photo popped up out of the blue thirteen years later ---
In 1976, during the Schweiker-Hart assassination investigation, another "backyard photograph" emerged. This one was found by Mrs. Geneva Ruth Dees, widow of Roscoe Anthony White, who began working for the Dallas Police, in the photographic department, on October 7, 1963. The picture was found among a collection of 40 photographs retained by White as souvenirs. According to Mrs. Dees, White, her former husband, was skilled in trick photography.

I suspect that Roscoe White could have been involved in framing Oswald.

I still wonder why.... Why no other rolls of film were ever connected to that camera?...Also where were the negatives processed and printed? ..Why was the rest of the film roll not utilized? ... I mean regular routine family pictures should have conscientiously occurred to a somewhat frugal Oswald.
Sorry...58 years later and it all still really stinks.