Board Thread:Questions and Answers/@comment-26467675-20150605143305/@comment-25971820-20150610045342

If you don't remember the exact date you started playing, maybe you could tell them about the event during the time you started playing.

The account retrieval isn't a quiz. They are asking questions to make sure that you really are the owner of the account. The best thing is to tell them as much information possible (especially in-game account-exclusive information) as to help you in your case.