The message that plays when you reach his voicemail is whatever the generic thing that came with the phone might be. This one isn't technologically savvy enough to even realise there's a message he can change. But feel free to leave a message. He'll probably figure out how to listen to it... eventually.
If you happen to know where his locker is, you may be better served by dropping a note in there.
If you happen to know where his locker is, you may be better served by dropping a note in there.