Actually the user ID's being generated are sequential, and there was around 130 people already in the system before we were let in. So if you go to your settings you can see your ID. If your ID is between 130 and 630 or so you will most likely be recieveing a shirt.
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If you look in your profile page you can see how long you have been a member. They will just run a report on that and get the list from there, so don't sweat it, they will contact you if you are on their list 🙂
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