Erastus Snow relates what Joseph told him about contents in the 116 pages.
Erastus Snow, "God's Peculiar People Called A Kingdom of Priests," May 6, 1882, Journal of Discourses, 26 vols. (Liverpool: John Henry Smith, 1883), 23:184–185
The Prophet Joseph informed us that the record of Lehi, was contained on the 116 pages that were first translated and subsequently stolen, and of which an abridgement is given us in the first Book of Nephi, which is the record of Nephi individually, he himself being of the lineage of Manasseh; but that Ishmael was of the lineage of Ephraim, and that his sons married into Lehi's family, and Lehi's sons married Ishmael's daughters, thus fulfilling the words of Jacob upon Ephraim and Manasseh in the 48th chapter of Genesis, which says: “And let my name be named on them, and the name of my fathers Abraham and Isaac; and let them grow into a multitude in the midst of the land.” Thus these descendants of Manasseh and Ephraim grew together upon this American continent, with a sprinkling from the house of Judah, from Mulek descended, who left Jerusalem eleven years after Lehi, and founded the colony afterwards known as Zarahemla and found by Mosiah—thus making a combination, an intermixture of Ephraim and Manasseh with the remnants of Judah; and for aught we know, the remnants of some other tribes that might have accompanied Mulek. And such have grown up on the American continent. But we are not informed that the Prophet Joseph and the first Elders of this Church who were called and chosen of God to bear the Priesthood and lay the foundation of this work, were descended from any portion of those remnants that peopled America anciently, and whose history is given us in the Book of Mormon.