What did Percy Jackson do with medusa's double-bagged head?

Percy Jackson took Medusa's head, which he had severed during their encounter in "The Lightning Thief," and double-bagged it in a waterproof sack to contain its dangerous powers. He later used the head as a weapon by sending it to his enemies, including turning the monster’s gaze on a group of unwanted visitors at a party. Ultimately, he also sent the head to his friend, Luke, as a way to deal with their shared adversaries.