Joseph wrote in his journal that the Lord revealed the contents of the Book of Moses.
Joseph Smith, History, 1838–1856, volume A-1 [23 December 1805–30 August 1834]: 81, The Joseph Smith Papers website, accessed July 7, 2022
The common remark was, they are “lost books”; but it seems the apostolic churches had some of these writings, as Jude mentions or quotes the prophecy of Enoch the seventh from Adam. To the joy of the little flock, which in all, from Colesville to Canandaigua, numbered about seventy members, did the Lord reveal the following doings of olden time from the prophiciy of Enoch.