I was out of town for two days and went back last night to play the two days I missed. I caught up on this thread and thought that I would at least be able to try my luck on the last day of the contest.
Interestingly enough, this morning Kobo had no record of me playing the two days I missed, so I got to play them again. And just now, I went back just for laughs and again found that it had no record of me playing any of the last three days. So I've got a chance to get a 75% coupon yet. I managed to get a 65% one earlier this morning. Of course, it would be really nice if I could take it somewhere other than the US, but at least I was able to get the discount-eligible book I had on my wish list today.