vBulletin.org can not help you in this situation, we never see customer details, license numbers, customer numbers etc.
We simply verify your account here via the e-mail address you used in your account here. In the members area there is a page where you can input up to 3 e-mail addy's, anyone using these addy's on vBulletin.com's forum, here, or vBulletintemplates.com is allowed access to restricted forums.
Contact support via the e-mail address zak gave you (support@vbulletin.com) and tell them the e-mail addy you used in your account here, they will be able to trace it back to the license it is associated with.
On that note, thread closed. As stated numerous times, there is absolutely nothing this site can do to recover your license information at all. You need to contact support@vbulletin.com. You can retrieve license information for a still-active e-mail address bound to your license by going to the Member's Area and clicking Cancel on the authentication dialog, then following the appropriate links.