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I finished the game and unlocked the flower mask, the monster mask and found objects like the postcard and the monster plush. The problem is that I didn't understand what it can be used for, except for the hateful side. When we leave the cave at the beginning of the game the ghost tells us to send him a postcard but we can't put anything in the mailboxes... Anyway, if someone has discovered the secrets, I'm in for it. Thanks
According to there's no use for the postcard.