When I accepted the quest, it said lupin dolls as well, but after collecting the items and going to turn the quest in, a different item is being requested. Really misleading and wasted a lot of time.
Very sorry about this, the quest will require the Tauromacis Horn this time round, but this is a mistake and should have been the Lupin Dolls. I have fixed the issue for next time this particular quest is picked up, and it will properly require Lupin Dolls from now on. If you hold on to the Lupin Dolls I'm sure they will come in handy again soon, or you can sell them for quite a bit of mesos later in the event.
