Corrill recounts Joseph's description of the plates.
John Corrill, A Brief History of the Church of Christ of Latter Day Saints (St. Louis, MO: “Printed for the Author,” 1839), 12, The Joseph Smith Papers website, accessed August 11, 2021
The simple story as related by others was this. Sometime in A. D. 1825, as nearly as I can recollect, Smith was informed by an angel, that there was a valuable record concealed in the earth, and the time had now arrived for it to be brought forth and published to the world. After being warned several times, he went to the spot and found the record engraved on leaves or plates of gold, fastened together by rings passing through one edge of all the leaves, on which they would turn as you opened them. The plates, as near as I can remember, were said to be about six by eight inches square, and very thin. This Book was carefully enclosed in a stone box, provided for that purpose, which Smith broke open.