Find and defeat the Chomper Merkbees near the entrance of the Lost Mines. You will acquire the Completely Useless. Bag. Give this to GuardLandau at the Dimita Oasis.
Guard Landau: Well, today's pretty much the worst day ever. HiiragiKagami: See! He's just having a bad day! NakanoAzusa: What happened? Guard Landau: I lost my bag. NakanoAzusa: Was anything expensive in it? Guard Landau: No! I'm broke. You think I work this job for fun? You Guard Landau: think I say, "Have you seen anyone suspicious?" and "All Guard Landau: clear!" because that's how I feel? NakanoAzusa: No, I suppose not. Guard Landau: I don't care if you've seen anyone suspicious. What am Guard Landau: I gonna do about it? Run a full-scale investigation? Guard Landau: Why don't I just stay in the guest room at the Lakian Guard Landau: Fortress and tell the Lord Marshal about it over Guard Landau: breakfast? Sound like a good plan to you? HiiragiKagami: Let's just go get his bag so we don't have to listen to HiiragiKagami: him anymore... Guard Landau: "All clear!" isn't even true. We're surrounded by sanja. Guard Landau: I can't believe the captain still falls for that one.
Reminder Dialog
Guard Landau: Sure. Let's talk about how I lost my bag. That'll cheer Guard Landau: me right up.