I'm still alive. After spending entirely too much time looking through my earliest mods (earliest one I could find was made on Sep 19th, 2010), looking at my forum registration date (May 31st, 2010), and finally looking at the forum registration dates of people with BL_IDs close to mine (various accounts from early 2009 to late 2009), I'm fairly confident I (read: my parents) bought my key in mid-2009.
If anyone else has a better estimate for when BL_ID 11239 might have been bought, feel free to correct me. I don't have the original e-mail receipt available for dating, so estimates are as close as I can (be bothered to) get.