On December 10, 1140, he obtained "Byobu Dodai" (the draft for a (Han) poem to be written on a screen) written by ONO no Tofu and "Hakurakuten Shikan" (Poetry Anthology of Bai Juyi) (TAKAMATSU no MIYA ke bon (TAKAMATSU no MIYA family version)) written by FUJIWARA no Yukinari, and managed to uncover that "Byobu Dodai" was written by Tofu at the age of 35, in December 928, and that "Hakurakuten Shikan" was written by Yukinari at the age of 47, on October 8, 1018, and noted these findings in their respective postscripts.
保延6年（1140年）10月22日、小野道風書の『屏風土代』と藤原行成書の『白楽天詩巻（高松宮家本）』を入手し、『屏風土代』は延長(元号)6年（928年）11月、道風35歳の書であること、『白楽天詩巻』は寛仁2年8月21日、行成47歳の書であることを鑑定し、それぞれの奥書きに記している。