Not sure if this will help, we did a redeposit by phone for my girlfriend and it shows the redeposit date as the date of the purchased ticket, so we were looking for her miles, calling etc., and then I looked at recent activity and it showed 11/x/2011 Redeposit 40,000
Who the hell thought this up is beyond me as rarely do we know when we booked the ticket, only when we redeposited it.