After you complete the Dastardly Detective: Before the Torch Burns Out side case, you’ll receive yet another update for the “noise” keyword. Open your phone and search Buzz Research with it. Select the post from hamburger and make your way to it on E Central St. Break out the Detector and follow the signal to a brown wallet on the ground next to the red box in the parking lot. Examine it to begin the Dastardly Detective: The Eavesdropping Wallet side case. Break out the Detective Dog and follow it until a cutscene triggers. When it concludes, the case will close!