"And it came to pass that I, Nephi, beheld that they did prosper in the land; and I beheld a book, and it was carried forth among them. ... And he said: Behold it proceedeth out of the mouth of a Jew. And I, Nephi, beheld it; and he [the angel] said unto me: The book that thou beholdest is a record of the Jews, which contains the covenants of the Lord, which he hath made unto the house of Israel; and it also containeth many of the prophecies of the holy prophets; and it is a record like unto the engravings which are upon the plates of brass, save there are not so many; nevertheless, they contain the covenants of the Lord, which he hath made unto the house of Israel; wherefore, they are of great worth unto the Gentiles." ~ (1 Nephi 13:20 & 23)

The Book of Mormon parallels the contents of the plates of brass of Laban, kept by the house of Joseph, with the Bible which was kept by and is the record of the Jews. In this particular reference, the angel states to Nephi that the record of the Jews did have as many of the prophecies of the Prophets as did the plates of brass. And this was true though many of the 'latter minor' prophets of the Bible are not in the plates of brass either. The plates of brass having ended at the time of many of the writings of Jeremiah. Even still, it does seem that the plates of brass were greater in volume containing many prophets and prophecies not kept or preserved in the 'record of the Jews'.

Since the plates of brass were kept by the house of Joseph (1 Nephi 5:16), it would certainly be likely that it contained many writings of such prophets as did minister unto the Kingdom of Israel or Ephraim as opposed to they which did minister primarily to the Jews. Four such prophets are mentioned by name in the Book of Mormon, whose prophesies in part are referred to and written into the Book of Mormon record. These four are Zenock, Zenos, Neum and Ezias (Helaman 8:19-20 and 1 Nephi 19:10), plus there is also reference that they contain the very prophecies of Joseph (2 Nephi 4:2), perhaps more and in greater detail than paraphrased by Lehi (2 Nephi 3) and preserved by the Joseph Smith Translation (See JST Genesis 50 etc.). All four of these prophets seem to be particular prophets sent of and to the house of Joseph/Ephraim, the Kingdom of Israel, and prophesying unto them apart from the Kingdom of Judah. And this presents that interesting conclusion that the plates of brass, the record of Joseph, when it is brought forth, will contain many more prophecies than the Bible and many of those being more particularly set forth from the persepctive of the house of Joseph-Ephraim, the Kingdom of Israel, the house of the covenant of the blessings of the fathers which were preserved through Joseph (D&C 27:10).

Thus a prophecy concerning what is to be found in the contents of the plates of brass would include that they will present the 'Gospel' of the 'Covenant' of the house of Israel from the perspective of the house of Joseph/Ephraim as oppossed to that particular perspective which has been preserved in the Bible, kept by the Jews from the particular perspective of the Jews. Thus the record of the plates of brass ought to clarily set forth that the Messiah is the legal and rightful seed and heir of the house of Ephraim and thus of Joseph, though having been born of the surrogate vicarious 'redeemer kinsman' Boaz.

Further, it can be looked to to contain such additional prophecies such as that held only in Jewish tradition of Rachel and her being the ancestor of the Messiah and the true mother of Israel and of the house of David. Thus it will varify and explain why it was Rachel who did weep from the murdered children of the house of David by Herod and not Leah.

Also it may well contain that 3^rd prophetic dream, if not also others, of Joseph of the Rotten Fruit held only in Jewish tradition of Joseph being the ancestor to the Messiah. And it should also further clarify the very blessings of Jacob upon Joseph and Ephraim, that Ephraim is the head of all Israel, that Judah does not prevail over Ephraim in the covenant, and that the Messiah is of the house of Joseph and Ephraim as indicated by the various Biblical scriptures referenced in this book throughout though held only in the background against the very Jewish perspective of the Biblical record of the Jews.