Its a scavenger hunt. You give the war memento to Kent which will give you gourmet tomato salt. You give this to Gus who will give you a Stardew valley Rose. You will give this to Sandy who will give you a tv remote. You give that to George, he will give you this arctic shard. You give this to the Wizard who gives a worm (come on wizard
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). You give that to Willy and...tada! You get the Locket. Then you just have to give it to Birdie.