The official story has it that Oswald closed his P.O. Box on May 14.
However, the official story also has it that Oswald moved to New Orleans, by bus, on April 24.
That's from the interactive timeline of the life of Lee Harvey Oswald by John McAdams. So, Oswald was in New Orleans on May 14, and it's not in dispute. So, how could he close a post office box in Dallas on May 14 if he was in New Orleans?