As I have explained to others it is seriously easy to register any invite on ScT within 3 or 4 hours of it arriving in your inbox, and I haven't failed yet.
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they prune every hour, just go on the hour and you'll get in IF you have an invite. Worked fine for me anyway :P
Just install C4C Add-On for Firefox. it'll tell U any changes in the link's status.
I was told to do so here- it worked nice and easy.