http://www.sportsbook.com/info/withdrawals.php
About halfway down the page it says:
[ QUOTE ]
(If) you have any other questions about your withdrawal, please give us a call at 1-800-632-6088 or email us or click here to enter our livechat for any questions
[/ QUOTE ]
I'd really suggest trying their livechat or their 24x7 800 number. You're going to get a much more immediate answer and a more authoritative one.
-P