The digital TA license and the LivePocket digital ticket aren't required anymore, they only check the ID/passport. That's because your name is written on a post-it behind the printed ticket (which is itself anonymous), so they ask you to confirm if it's your name before handing the ticket.
As for the TA booth, just look for this TA sign near the goods, you won't miss it.
(it's a table where 2 girls are sitting behind for the lottery and the exchange of tickets)
The lines were kinda inexistant for the Chiba (chap.II) and Nara (chap.III) shows, exchanging tickets at the TA booth was very fast.