Hopefuly he is a little more mature then that. I can fully understand why taking a sword on campus isn't a good idea, so he should leave it some place safe.
... I brought my wooden and bamboo practice weapons to campus when I went to college. You can, in fact, either kill or severely incapacitate someone with those. Left them in plain sight by my bed and/or under a bookshelf. No one bothered me about them, and I worked out with them regularly.
When I was in eighth grade and on a class field trip, some guy came up to the door I was sharing with some other girls and started screaming, throwing himself at the door, punching it, and shouting "let me in! Let me in!" It was pretty scary. I managed to get him to go away by out-shouting him, but I would've felt a lot better if I'd had something on hand--just in case.
The reason may be different, but hell... I brought that stuff with me for two reasons: first off, I thought it was kind of cool (could be a conversation piece or something--shh, I was naive back then), and second off, I really wanted to have it around. It's one of those things.
Eh. Long story, I guess. In any case, I don't see why we should mock him for wanting to have his weaponry nearby. No, it's not a "real" weapon. Who cares? It's his stuff, and he didn't ask "should I have weapons in the same city as myself," he said "Do you know any good places to store swords."
Other than moral support, OP, I'm afraid that I can't offer any other help. Sorry =/ But good luck.