Joseph Smith says that "it was not intended to tell the world all the particulars of the coming forth of the Book of Mormon."
Minutes by Oliver Cowdery of a general Conference held at the dwelling of br. Serenes Burnet[t] in the Town of Orange, Cuyahoga County, Ohio, October 25, 1831, copied by Ebenezer Robinson in ca. 1838 into Zion (Missouri) High Council and Nauvoo Stake High Council, “The Conference Minutes, and Record Book, of Christ’s Church of Latter Day Saints,” Minute Book 2, p. 13. Earlier originals not extant, accessed January 4, 2023
Br. Hyrum Smith said that he thought best that the information of the coming forth of the book of Mormon be related by Joseph himself to the Elders present that all might know for themselves.
Br. Joseph Smith jr. said that it was not intended to tell the world all the particulars of the coming forth of the book of Mormon, & also said that it was not expedient for him to relate these things &c.