Heya!
Did he talk to you about something? (it should have)
Most non-player characters will continue talking if you ask them about some "key" word they used in one of their last sentences.
If he didn't talk to you, then try looking at him - he's different from the other players. Ask him about it
It's like in all RPGs - players can do what the storyteller/master/keeper thought it's the most obvious thing, but only after long, long peregrinations into the Unlikely and some proud journeys into the Impossible.
Being yithian, I automagickally had a locker. But I believe I saw the quest. the rugby player in the room of the lockers is missing an accessory of him; an easily findable one. If you take it back to him, I'm sure he'll reward you a key.