Sometimes, and I say sometimes, if you can get the piece, as is, into a room with 55-70% humidity, the wood may absorbe some of the moisture and 'move' a little for you. HOWEVER, you'd have to leave it in there a while before you 'block' it. When/If you block it, you would need to do it a little at a time. Otherwise, you may split the wood and end up doing what 'jb' recommended.
Other than that, Henry in MI may have something to offer. My best to ya and hope this helps.