The lost original book written by NANBO in his own hand (except for 'Metsugo,' which was added after Rikyu's death) is said, after Sokei NANBO finished writing, to be given Rikyu's Kao (written seal mark) (along with the notes saying only 'Sumibiki' should be burned) to prove it's the original; but according to the theory that Nanboroku was written by Jitsuzan, everything was organized by him.
現存しない原本である南坊自筆本は、体裁としては南坊宗啓が書いた後に、利休に証明として在判（「墨引」のみは焼却するようにとの注意書き）をもらっていることになっているが（利休没後に書き足された「滅後」は除く）、実山創作説を採ると全ては実山による演出となる。