NO LONGER AVAILABLE!
I noticed this entry in the "Celebrate Alien Week" post:
So it looks like CIG will be hiding clues so that people can find their own code for a Banu lockbox. That sounds nice of CIG to offer an alternate means to obtain that flair item for those who can't make it to a Bar Citizen (and don't want to spend a fortune for a silly scratchcard on Ebay).