A glitch in the timeline....Notice the remarkable 'coincidence' that the pistol [supposedly ordered two months before the rifle was] was shipped and then claimed on respectively the very same day as the rifle.
What are the chances of this?
Also note that presumably...Lee goes over to take pictures at General Walker's before any rifle to shoot him with ever arrives.
Why in hell take pictures anyway? What purpose would it serve?
When seen in the "blue notebook " dossier that Lee created along with the BY photo and maps of the area near Walker's house the photo would serve to convince any viewer that Lee had been stalking Walker and planning to ambush him . And that was the crux of the plot.... The bullet hole in Walker's window was intended to be mute evidence that someone had tried to kill Walker ( a very vocal foe of Fidel Castro) Lee had created the false dossier with the idea that the police would trace the rifle ( which he had left for the police to find)
reminds one of the TSBD sixth floor ! Lee had planned to be a "fugitive" and on his way to Cuba when the police discovered the blue note book with the BY photo (CE 133A) and the photo of Walker's house in it.
The plot never blossomed because the police didn't fall for the nonsense that Walker spewed......