Stopped playing all Nutaku's games (and, thus, using HBC and other related forums) around 06.2016
Nutaku put a survey (well, is just one suggestion). Those who want the N event cards back, suggest to put them in GHQ while revival gacha is up.
Give one F2P game to a Korean: He will turn it in a P2W (pay to win)
Give one F2P to an American: He will turn it in a P2F (Pay to fail)
Nutaku ID: 454836
Don't worry. They're there. It's like e-gacha. You can't see your e-gacha tickets outside of events, either. Rest assured that when EG ends, you will be able to see your tickets again. Otherwise, send a ticket to Nutaku. From what I have heard, they are actually pretty good about fixing it when people do not get paid items for stuff like this. It's one of the few things that Nutaku does that I like.