It would seem that your claims are being filled from book keeping balances and that you may have failed to take into account coins that were debited from an account but not transmitted due to the theft. I attempted to transmit 1000 coins about 10 hours before you shut down. As you can see below I received the confirmation and my balance did show the debit. However the blockexplorer will show you that my coins never arrived at that address (which happens to be my main MtGox business account, called businessaccount1).
I fear that I may not be alone in this situation and that your simple percent distribution based on your books will now be upset. Customers who already received their claim will have received a hire percentage then those still outstanding when you add customers like me back in.
Did you got your 490 BTC and if yes how ?