Bug with villain's glasses (event quest chain)

Hi, today i experienced a bug with a quest item related to the event chain. After completing [help poor Mello out], where you are required to convince Jay, Igor and Rudolf, i teleported to the hut where you talk to Santa Claus to complete [C.O.C.K.], which requires giving him an item called "villain's glasses", a head slot item that you need to equip for the previous quest in the chain: my problem is that i unequipped this item before talking to Santa Claus, and said item vanished from my bags, thus making it impossible to complete the quest. I decided to abandon [C.O.C.K.], to try and take it again, but i don't have the villain's glasses anymore, and i can't talk to the invisble quest giver. Any way to solve this?