A Tip from the Post Office

Exploration Stage: Lamplighter's Workshop
From: Mr. Black
Description: Instead of focusing on the case you suggest using the pneumatic mail to hopefully get an answer in a special capsule? Hmm, maybe this is a reasonable idea. The ones we are looking for may be on the other side. Let7s find a capsule.
Completed: I wouldn't have believed it if I hadn't seen it for myself! We were sent a capsule with a clue. It's a sheet with strange symbols on it. Is it the combination to the fugitive's backpack?