Saint Patsy didn't purchase a movie ticket.
You don't know that.
Postal's box office booth was flush with the storefronts.
That's actually false.
Brewer saw Saint Patsy approach the theater and then disappear from view.
Brewer saw somebody (from behind about 50 yards away) approach the theater.
Had Saint Patsy stopped in front of the booth to purchase a ticket, Brewer would have been able to see the transaction.
Or that guy never went into the theater, or that guy already had a ticket, or that guy wasn't even Oswald.
Additionally, the box office only opened at 1:15 PM
That's a good trick, since War Is Hell started at 1:20.
and Postal had sold a total of 14 tickets, mostly to patrons that were waiting for the office to open for the first show.
That's also a good trick since Brewer saw 15-20 patrons in there.