It looks like the last session they did was on 6-27-07. I was just punching in numbers and the last one that registered was BB600431. My game used base is BB652625 from the Cards 8-31-07 game. So that means they only need to enter 52,000 items before they get to mine lol.

I thought the session number was just the date they were authenticated, but for your pants to have been authenticated before actual use is kinda weird. Maybe they know what they are going to auction or sell ahead of time and go ahead and authenticate it. Just my guess