This is a bit weird. An unregistered user asked a question here. Then instead of editing the question or adding comments, he started posting additional informations as answers. When I first noticed this I left a message telling him to edit the question. Then I noticed that the user number changed for him. I.E. he was no longer responding as the OP. How do we deal with a situation like that? Why did it happen?
In this situation, can the OP access the unregistered account to manage the question at this point? I'm at an absolute loss!
This happens when people use unregistered accounts. The only way to "access" an unregistered account is to use the browser you registered it on. So if you remove that cookie or use another browser/computer you'll have to create another unregistered account. If the user creates an account either with Stack Exchange or via OpenID login and the email address for that new account is the same as the unregistered accounts the system should automatically merge them and the user can then manage the question.