What happened to the original brass plates?

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?

Small brass plate found in old school yard, Pacific Northwest : r/whatisthisthing

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Mount%20to%20Picture%20Frames%2C%20Artwork%2C%20Awards%2C%20Plaques%2C%20and%20more!%0D%0AThese%20plates%20are%20solid%20and%20high-quality.%20They%20

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