Surely the club know through your membership number whether you have been successful or not. So when you go to buy online you can go through the purchase process without any blockages, and if you buy at the ticket office and provide your membersship number, they know immediately on their system that you're eligible.
Interesting that the ticket office managed to mess this up in 2007, honestly I don't know what happened at the time but I wouldn't put it past them to use some sort of ridiculous system.