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I tried to find out a few weeks ago, and managed to see that you seemed to be able to bet your account set to “Anonymous” if you asked for it (I figure in order to preserve the posts):
There is barely anything archieved from the early profile ID numbers that lead to one of those "The user whose profile you are trying to view does not exist." Type messages. I did find one though:
https://web.archive.org/web/20120326034624/https://bitcointalk.org/index.php?action=profile;u=407 (
https://bitcointalk.org/index.php?action=profile;u=407).
It turns out to be @SyphirX’s account. That account is not accesible, but does preserve the username tied to his posts (for example here:
https://bitcointalk.org/index.php?topic=407.0). On this same thread there is a post by "Anonymous", which I figure relates to a requested to delete account as per the quote at the top of this post.