Frazier saw him carry it into the building. His sister saw Oswald carrying a large package with him as he walked to Frazier's car. I know I'm a lone assassin sheeple who believes "thuh government" but I'll wager that he brought it with him to the building. He didn't leave it in the car.
You're responding to a person who doesn't believe Oswald went to Mexico City. All of the evidence that he did was faked, planted, manufactured to make it look like he did.
And I'll go back to asking the type of questions that the conspiracy believers hate: "If Marina and Ruth Paine and others were coerced into giving false testimony then why didn't they coerce them into saying they saw Oswald with a large package/bag that morning?"
They can't answer that. It causes all kinds of angry responses. Why? Because if they are forced to answer them, if they are forced to consider it, then their entire "Oswald was framed" theory is severely challenged. A kind of conspiracy cognitive dissonance ensues and they don't know how to react other than to be upset.
I know I'm a lone assassin sheepleBut at least you're warm. As for me, I'm a lemming. I know that because I was told so by a nobody so it must be true. Oh, yeah: I'm also a parrot, apparently. Looking on the bright side, I can follow other lemmings off a cliff, and then just glide away.
I do envy you. though. Because come shearing time, I could say
'short back and sides, please'