It is documented that Lee was at work at the time the MO was sold.....And Marina was not fluent enough to buy the MO and she would have had no way to get to the PO that issued the MO. The PO was located a couple of miles away ......And she probably didn't know about that PO because they received the mail at the main PO in downtown Dallas.
It is documented that Lee was at work at the time the MO was soldIt is true that there is indeed a handwritten time sheet that shows that Oswald did sign in for work that day. Whether you can conclude from it that he was actually at work the whole time and never left is another matter. But fair enough, the time sheet makes it at least unlikely that he could have gone out to buy the MO.
And Marina was not fluent enough to buy the MO and she would have had no way to get to the PO that issued the MO. The first part I am, quite honestly, not so convinced about but the second part makes sense. With a small kid at home, living in Oak Cliff she would have had to have gone to downtown Dallas by bus and that seems unlikely to me. Also, if she had bought the MO she would have been far more involved in whatever was going on than the record shows.