You can attach your mail to your windows account or xbox live, or other microsoft products. Im not sure if that counts as making it active by association, but it's a possibility.
Idk tbh, was just trying to throw things out there, because I think he cares alot about you guys, so i dont think he would not talk unless there was a real reason for it.
The only thing I could think of would be to do a name search or if anyone knows where he lived, to go down and see if hes thre. But then again, perhaps that would be an invasion of his privacy? idk