Sorry. I usually remember, but totally forgot this morning. I lucked out and two not-great seats later in the day and I only saw one left. Sometimes additional $10 seats pop up, but it's really hit or miss.
All tickets were gone in a few minutes. What showed up later may have been cancellations of some sort. I was on hold on the phone 35 minutes then hung up . All I heard was loud music till I couldn't take it anymore. At 10:30 a.m. there were none left. The online Web site said for both shows no seats available for the promotion. Only full price seats remained. This offer was for the first four previews. There is a limited amount of tickets in their promo. Glad some theatre lovers were rewarded.
I know I shouldn't share a secret, but if you haven't tried the app, it's very smooth and quick and I've had really good luck grabbing tix as soon as they go on sale (when I remember the on sale date :)