It is not necessary to determine who picked them up but we can draw a reasonable inference that they were probably picked up by Oswald because:
Let's stop right there with the conjecture. Supposedly... the weapons were conveyed around whenever and wherever Oswald changed location. Let's follow the pistol...
Mr. RANKIN. Do you recall when he first had the pistol, that you remember?
Mrs. OSWALD. He had that on Neely Street, but I think that he acquired the rifle before he acquired the pistol. The pistol I saw twice once in his room, and the second time when I took these photographs.
Mr. RANKIN. What period of time was there between when he got the rifle and you learned of it, and the time that you first learned about the pistol?
Mrs. OSWALD. I can't say.
Their own timeline investigation states that the weapons were obtained on the same day.
Mr. RANKIN. Do you recall the day that you took the picture of him with the rifle and the pistol?
Mrs. OSWALD. I think that that was towards the end of February, possibly the beginning of March. I can't say exactly. Because I didn't attach any significance to it at the time. That was the only time I took any pictures.
The only time that Marina
ever took any pictures...Of
Lee with the weapons [she claimed]--But put no significance on the event?
Mr. RANKIN. Was the rifle carried in some kind of a case when you went back with Mrs. Paine?
Mrs. OSWALD. After we arrived, I tried to put the bed, the child's crib together, the metallic parts, and I looked for a certain part, and I came upon something wrapped in a blanket. I thought that was part of the bed, but it turned out to be the rifle.
Mr. RANKIN. Do you remember whether the pistol was carried back in Mrs. Paine's car too?
Mrs. OSWALD. I don't know where the pistol was.
So...where in hell was that doggoned pistol?
There was no discussion of Oswald going to the pistol range...just took the rifle out to the airport----
Mr. RANKIN. Mrs. Oswald, if I may return a moment with you to the time that you told us about your husband practicing with the rifle at Love Field. As I recall your testimony, you said that he told you that he had taken the rifle and practiced with it there, is that right?
Mrs. OSWALD. I knew that he practiced with it there. He told me, later.
At Love Field Airport
..it cracks me up every time I see that. The Warren people knew that Marina was lying but they just let her ramble on.
At the HSCA hearing, the pistol was only mentioned twice...
Mr. PREYER. So that he went by bus to New Orleans, but he had packed his belongings and those were sent where?
Mrs. PORTER. Usually during the moving, Lee was always doing that. He was the one who did all the packing, not me.
Mr. PREYER. So that you and Mrs. Paine later brought all of the,----
Mrs. PORTER. Yes.
Mr. PREYER [continuing]. Remaining luggage?
Mrs. PORTER. Yes.
Mr. PREYER. Including the rifle.
Rather than being a question....Preyer just made the assumption for everyone.
This is from the Clay Shaw trial----
Q: Did you ever see Lee with a pistol?
A: I don't remember now, sir.
Q: You don't remember seeing him with a pistol?
A: No....... 
Q: Is it a fact you took a picture of him with a pistol and a rifle?
A: Yes, sir, I recall right now.
Q: When did you first see the pistol?
A: The thing was, sir, when I took the picture I didn't know how to take a picture -- even right now don't know -- I just took the picture, and later on in the picture I saw that.
Q: You didn't see the pistol when you were taking the picture?
A: No. I mean it happened to there, but I didn't. I can't recall exactly when I saw the pistol.
I have no idea what that last reply meant.
So Ruth and Marina loaded the car with stuff including the weapons [we are led to believe] but they had no idea that there were guns in the car. We are further told to believe that Marina and Ruth returned with at least the rifle and they had no clue that it was there. That leaves two probabilities....
One-that Ruth and Marina were both complete mindless idiots..Or-
two- that there never were any guns. Now believe what you want.
