I searched and saw your answer to this question, but it didn't answer it. Do you or any church historian know what happened to the brass plates after Mormon transferred them onto the gold plates?
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File:Brass plate depicting the Ekpe spirit.jpg - Wikipedia
Each Piece Has a History: The Mysterious, Old Brass Plate – Charlie Rees
File:A large brass plate 02.jpg - Wikimedia Commons
What happened to the original brass plates?
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