Have you checked yourself if the history text is online? Check with the publisher.

As for the locker. Is the lock one of those standard rotating locks? If so those are tricky to use. If so and he wants to use his I'd recommend buying a lock at a hardware store to have him practice the technique. You can often get them for under $5. My son doesn't use one and my daughter only rarely used her when she was in H.S. My experience is it depends on the school culture how much they are used and if kids have bulky coats & boots they don't want to lug around all day.