coffeecup: Currently there is a support ticket since Friday open for me, so I hope my reply to their answer is being processed soon (tm) ... well really, I don't think so that I'm not alone :)
Leroux: You can redeem each code individually though and the games will be added to your account only after you've confirmed the ones you want to redeem. Still a little inconvenient if you want to gift to (or trade codes with) more than one person, because you'll have to trust them not to redeem the games that weren't meant for them. But just in case this is what your support request was about, it should be no problem for you to redeem the games you don't own, and the other ones will remain on the code.
I just want to have my support ticket processed, the one game I don't own yet redeemed and the other ones converted into store credit :)
So far, I am happy with the pinata sale, though I got some games I was only mildly interested, but that was ok.