From the Instawallet claim process thread posted by Davout himself last month:
The claim ID is character string labeled "Claim #" on the claims page.
Please post to us your Claim # so that we can all start helping you with one thing: talking with Davout to get some of your Bitcoins from Instawallet and, at the same time, remove doubts that you might be holding to Bitcoins.
That would be a great good faith display in order for us to start talking about partial refunds from the loan you received with values closer to that of paper money.