So what?
It accounts for his whereabouts at that point in time.
Why?His punch mark was standard operating procedure. The transfers are also numbered. This is how they kept track of who issued the transfers, and where, and for how long they were good for.
his whereabouts at that point in time?. According to the time punch ...
Mr. McWatters. Well, they told me that they had a transfer that I had issued that was cut for Lamar Street at 1:00, and they wanted to know if I knew anything about it. And after I looked at the transfer and my punch, I said yes, that is the transfer I issued because it had my punch mark on it.
Mr. Ball. Did your punch mark have a distinctive mark?
Mr. McWatters. It had a distinctive mark and it is registered, in other words, all the drivers, every driver has a different punch mark.
Oswald left the bus at 1:00? 1:00PM?

Of course that couldn't be right could it? That blows the "whereabouts at that point in time" into lala land huh? Evidence that he was on the bus doesn't prove that Oswald shot anybody so it is moot. It seems like the cops located the bus driver and then asked him if that transfer was his

Makes no sense.
Why didn't the cops ever locate the bus driver or drivers who took him downtown and home from work on a daily basis? They might have had some useful information.