On Sept 19 1963, apparently in anticipation of his expected long bus journey to Mexico City, LHO took out four books from the New Orleans library:

Someone then returned them to the New Orleans library on Oct 3rd (at a time when LHO was on his way to Dallas from Mexico). This has to be proof LHO was not on his own in Mexico. Presumably, whoever he was with, he gave that person his library books to return to New Orleans once LHO realized he would not be getting in to Cuba.
Why is there no mention of this in the Warren Report?
This has to be proof LHO was not on his own in Mexico.The more likely explanation is that the books were returned before LHO left New Orleans and simply were not processed by the library until 10/3.
However, on page 742 of “Reclaiming History,” Vincent Bugliosi says that: “All three Bond novels turned up in his Dallas rooming house after the assassination.” There is no source note for this claim. I question Bugliosi on this one...