Abstract: The Book of Mormon contains little information about what the Brass Plates contain. Nephi said it was a larger record than the Hebrew Bible brought to America by the Gentiles. But it could not have contained the records of Old Testament prophets who wrote after Lehi’s party left Jerusalem or the New Testament. We know it contained some writings from Zenos, Zenock, Neum, and Ezias, but what else could it have contained? Though the proposal from modern biblical source criticism that the Christian Bible is the product of redactors sometimes working with multiple sources is distasteful to many Christians, this article suggests this scholarship should not trouble Latter-day Saints, who celebrate Mormon’s scriptural abridgement of ancient American scripture. This article also revisits the insights of some Latter-day Saint scholars who have suggested the Brass Plates are a record of the tribe of Joseph, and this may explain its scriptural content. The eight verses from Micah 5, which Christ quoted three times during His visit to the Nephites and which did not previously appear in Mormon’s abridgment, receive close analysis.