i've never had a problem, although i don't understand the question " all your passwords " , does this mean you have multiply accounts?
if the answer is yes i've simply rang them with appropriate references like details of the purchase, or i've even just asked what email address is associated with a domain.
i start accounts for client ( use to, haven't been bidding in almost a year now ) so i'd use different email addresses but i recorded them, the few i stuffed up i found out the email off nf and then did a forgot password, tapped into the cpanel access email of the clients domain ( as i host them) and got the password, then deleted the email as they would only ring me and ask " WT..."
but as far as giving you a csv file i can see that would be impossible to filter out for you imo.
tim