What onlookers? Oswald's only concern would be curious fellow employees inside the TSBD... between the back door near the loading dock and the freight elevators. Even the ever-alert Jack Edwin Dougherty never saw Oswald's package as he passed by.
Onlookers getting information about the contents of a paper package from the method of folding the end of it?
Colin: Are you implying that "onlookers" have x-ray vision?
I don't know what Oswald's concerns were, are you able to read minds? I am not implying x-ray vision but the grasping of the barrel as I believe has been implied gives some information as to the shape of the contents underneath.
In the position he was assigned by the WC narrative one assumes his concerns would be; a) a secure means of transporting the weapon, ie. one that would make it impossible for the contents to be revealed by accident, b) some arrangement that would not arouse suspicion or curiosity before the event.
To my mind simply folding down and "scrunching" the open end satisfies neither whereas a fixed seal of some sort does. If nothing for the ability to prevent nosy onlookers, TSBD or otherwise, from asking for a peek.
Here is an onlooker's description of the bag.
Mr. BALL. What was he carrying?
Mrs. RANDLE. He was carrying a package in a sort of a heavy brown bag, heavier than a grocery bag it looked to me. It was about, if I might measure, about this long, I suppose, and he carried it in his right hand, had
the top sort of folded down and had a grip like this, and the bottom, he carried it this way, you know, and it almost touched the ground as he carried it.
Mr. BALL. Let me see. He carried it in his right hand, did he?
Mrs. RANDLE. That is right.
Mr. BALL. And where was his hand gripping the middle of the package?
Mrs. RANDLE. No, sir;
the top with just a little bit sticking up. You know just like you grab something like that.
Mr. BALL. And he was grabbing it with his right hand at the top of the package and the package almost touched the ground?
Mr. BALL. Now, was the length of it any similar, anywhere near similar?
Mrs. RANDLE. Well, it wasn't that long, I mean
it was folded down at the top as I told you. It definitely wasn't that long.
Given LMR described the folding down of the top end, how long do you estimate the fold over to be?