No one in the whole movie ever asks anyone, Did you write this letter' Part of the reason is that no one wants to hear that it isn't for them. As soon as they read it, they want it to be theirs.
“Things have gone beyond my wildest expectations and dreams, and I feel like I've been given so many blessings in my life, between my friendship with the guys in the band, our wonderful audience, being able to play this music, and then my family.”