German police are seeking your help in gathering information related to a MAC address that could lead to the cell phone device used by a DHL blackmailer who parceled out bombs at different addresses in Brandenburg and Berlin last year. The German police successfully communicated with the alleged blackmailer multiple times via an email and succeeded in capturing his/her Motorola brand device’s MAC address. Since every electronic device comes with a unique MAC address, police are trying to use this information to map out all Wi-Fi networks that the culprit used.
Source: https://thehackernews.com/2019/01/german-dhl-parcel-bomb-blackmailer.html