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If he could live with the leaves a little smaller you could rip the leaves into more narrow pieces and reglue them. If the underside of the leaves were left raw wood that might have contributed to the warp. If that is the case you might set the leaves in a sunny location with the underside up and dry that side of the wood out assuming that side is the side with the crown on it. Once you get it flat you could seal the underside with a finish to prevent it from warping again.
