Neon Cache

From: Kira Woodville
Description: We've supplemented Sophia's dossier, but I feel like we've missed something. We examined everything related to old unsolved cases and everything that arouses suspicion... Or did we? Take a look, there's a neon picture over there. Lend me some tools, I want to inspect it!
Completed: Aha, I knew it! The hat, couture dress, and the guitar - they're all just a distraction to hide something really interesting. Would you look at that - behind the picture is a cache full of letters. Well, well, who are they addressed to? Oh, thats embarrassing - they're addressed to Sophia's mother...