How can one join in September 2004 and have their first post on July 8, 2003? Hmmmmm...
Different scenarios with vBulletin. At that time, as in many other websites, you didn't have to register, and you can post freely with any name you want, or as "guest." Or, when vBulletin upgraded, it carried over earlier registerees into the new system, which was recreated in mid to late 2004. There are a myriad of things that could've happened.
I always thought you were Australian as you have that flag there.