[Patrick C]

It hardly matters that Oswald may have visited on mid week days before. So what.

What is interesting and more important is that he was due on the Friday that week and not the Thursday, otherwise Ruth and Marina would not have been surprised.

It is pretty clear that he went deliberately to collect the rifle - or if you believe in a conspiracy, that he went to collect something as part of some pre arranged activity, although for me the curtain rods story is a pile of tripe.