I don't think so, but I'm not positive. Will dig out my copies of the Dunn letters. I have not seen the originals of them, but have seen what I believe is the original of this letter.
Matt must have been well thought of, as there is also a letter to his wife from my great uncle John Cain Wilkinson telling of his death.
Give me a day or so to find my copies of the Dunn letters and to get in touch with the person that has this letter.