Tyler was asleep through most of what the lady just said in the classroom. He was starting to wake up and only heard the last thing she said. But he was confused since he wasn't paying much attention at all. So he looked around and saw other the students grabbing boxes which he got a yellow box, hoping he didn't chose the wrong one. 

Then there were people heading for a staircase which he didn't know where they were going at all. Then there was talk about having a room number which was probably mentioned in the classroom but he was asleep. Well at least he didn't get caught and then some student asked for his room number. So maybe it wasn't mentioned which is great for him at least for now. The only thing he must of not heard are probably the rules or something.