Let’s consider the revolver since he ordered it about six weeks before he ordered the rifle. It does seem reasonable that if he intended to use the revolver to shoot Walker, he most likely wouldn’t expect to get away with it because using a revolver would typically need to be at a relatively close range with other people being present. Under those conditions using a separate P.O. Box makes less sense.
However, it seems to me that by March 12, 1963 LHO had probably devised his plan to shoot at Walker with the rifle at night from behind the backyard fence and his expectations of getting away with it would have been more reasonable. In fact it appears that he planned to do just that (get away with it). And he apparently delighted in learning from the news accounts that the DPD apparently didn’t even consider that anyone would try to make an escape from the scene via public transportation. Under these conditions, using a separate P.O. Box would seem to me to make more sense. He wouldn’t need to maintain the P.O. Box any longer than it took to obtain his rifle. So the expense would have been minimal and prudent in my opinion.
Let's try to make sense of the Walker shooting.
First of all, I've always wondered how it came to be that reporters started asking questions about the Walker shooting so quickly after Oswald's arrest. What was it that linked Oswald to that shooting that reporters could have know so quickly?
But beyond that, if we assume that Oswald did order the revolver later used to kill Tippit instead of, as he claimed, buying one in Fort Worth, and if we assume that he also ordered the rifle with the intention to try and kill Walker, how in the world does that compute with him being photographed with a revolver and a rifle prior to the attempt?
I mean, this is somebody who wasn't known to own weapons, who allegedly orders a revolver and a rifle, in a traceable manner, when he easily could have bought untraceable weapons. Even worse, he then shows George de Mohrenschildt and Micheal Paine the rifle at the Neeley Street address and he has his picture taken with them. Seems a weird way to prepare for an attempt to murder somebody.
But it gets worse, he carries a rifle allegedly used in an attempted murder to New Orleans on public transport and when Marina was picked up by Ruth Paine he decided to wrap that rifle in a blanket, with a piece of string around it, and risk that it could be easily discovered only to leave it stored in a garage for two months where it was moved several times.
How does any of this make any sense?