I send it right through listia - the winner will be the only one who gets the auction link at the end and only they will see the codes. I believe they do go through your email as well.
I just realized I will be at my son's Christmas concert when this auction ends - so I will send them as soon as I get home - should be at least by 9 p.m. Sorry - I try to get these out within minutes of the auction ending. But I will send them tonight to the winner - as soon as we get back home from the concert.