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.