I often think about how kids make dumb mistakes because the lack the experience to know better, and how that lack of experience is also what makes them unafraid of new tech and willing to try things out.

Old people get stuck in their ways, perhaps because they've been conditioned to think that other ways are dangerous.

Anyway, I don't know how coin lockers work, but how was he able to put it into an open public locker that you weren't able to subsequently open? If he was able to put it in, doesn't that mean you should also be able to take it out?