...or (as I said earlier) the bolt handle was knocked up when the rifle was dropped/thrust between the heavy boxes. I'm not saying that Oswald threw it down there (he was in the Domino room at the time).
If you had a carcano , I'm sure that you'd drop the idea that the bolt was closed and latched but was "knocked up" when the rifle was thrust between the boxes..... the main reason that didn't happen is because the rifle wasn't thrust between any boxes.
It was found lying on it's side on the floor .....It was not jammed between boxes. I doubt that the yokel who hid the rifle "dropped it" on the floor....He placed the rifle there and stacked the boxes of books around and over it.