I agree that the nature & history of fur felt hats is such that you should expect to be able to steam & reshape one unless the seller advises otherwise.
If the seller won't credit for an exchange (Christy's should accept it from their vendor, you would think), then I'd try to re-block it.
If the seller won't credit for an exchange (Christy's should accept it from their vendor, you would think), then I'd try to re-block it.