Unusual Key

Exploration Stage: Shooting Star Cabaret
From: Mr. Black
Description: How can we talk about some gift when the safety of the City is at stake?! It seems that we'll have to look into Sophia's cache. Don't ask how I know about it! She keeps her most precious things in there - I'm sure there's something inside that's connected with her precious gift. To open it, we'll need a few keys. Let's find them!
Completed: You found a sapphire pin? You think it'll open the lock? Hmm, you're right, this adornment is perfect for one of the cache's keyholes. It turns out it's also a key!