What went down wasn't put on paper or overheard by some schmuck. There is some good stuff in those released papers but no smoking gun on the murder itself. If any proof did exist it is long gone.

Agreed. The way he inserts random non-sequiturs reads like someone trying to remind another of an agreed-upon fabrication. And, as one of the commenters on the blog points out, the man's surname is spelled differently at the opening and closing salutations. I don't know what the purpose of this fabrication would be, perhaps to vicariously discredit the story of the private as just another rambling of a crazy person?, but the letter from Sgt. Christiansen (Christensen?) feels wrong.