It's sad, but twitter's not transferring it back in a week's time gives me more confidence in twitter, not less. There isn't any evidence of the stealing of the domain names and the extortion available besides OP's copies of the email messages and information that GoDaddy won't provide. With the value twitter ID has, twitter shouldn't do anything without clear evidence.

He might have been able to get it back if it was his trademark or even name that he lost and not some witty username.