As told by historian Susan Easton Black, converts to the Church of Jesus Christ in the 1800s when Joseph Smith was prophet, had heard about the record found near the Smith family farm. Whether they saw the plates themselves or held the printed Book of Mormon in their hands and gained an immediate testimony of it, none of them would ever deny the veracity of the record, whether they stayed or fell away from the Church.
Converts mentioned in this episode are:
William Huntington (1784-1846)
Jared Carter (1801 – 1849)
Noah Packard (1796-1860) 
Parley P. Pratt (1807 – 1857)
Oliver Cowdery (1806 – 1850)
David Whitmer (1805 – 1888)
Martin Harris (1783 – 1875)
Peter Whitmer, Jr. (1809 – 1836)
Christian Whitmer (1798 – 1835)
Jacob Whitmer (1800 – 1856)
John Whitmer (1802 – 1878)
Hiram Page (1800 - 1852)
Joseph Smith, Sr. (1771 – 1840) 
Hyrum Smith (1800 – 1844)
Samuel H. Smith (1808 - 1844)
Lucy Mack Smith (1775 – 1856) 
Joseph Smith, Jr. (1805-1844)
For more testimonies of early converts to the Church, refer to Susan's book Stories from the Early Saints: Converted by the Book of Mormon (1992)
Susan first read the Book of Mormon when she was eleven years old.