Though Lechi hailed from Joseph’s lineage and knew of the Brass Plates, it’s clear he didn’t know much about their true contents until he had read them.
The Tanakh frequently mentions “lost books” that are cited in the Tanakh, but which do not appear in the current collection of books. The list of such “lost books” includes...
In recording the execution of Zemnarihah, the Stick of Joseph records: And there were many thousands who did yield themselves up prisoners unto the Nefites, and the remainder of them...