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Why couldn't the amulet have been hidden by Aunt Alice, who understands modern key exchange algorithms?
Animatronio mentioned a fountain. That's a statue of Neptune, god of water. The number of points on him trident is three, or trey. The "u" in his name is written like "v". Trey, "v". Trevi! It's the Trevi Fountain. There can be no question!