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.
“I have to get a licence to drive a motorcycle to protect myself and the people around me. I am adamant there should be some sort of licensing required to have children.”
“'How do you know so much about everything?' was asked of a very wise and intelligent man; and the answer was 'By never being afraid or ashamed to ask questions as to anything of which I was ignorant.'”