My Mac mini was stolen from my office and I think it was stolen by one of my colleagues. All of them are software engineers and I think the thief will install a fresh version of macOS on the stolen Mac mini. So I know I can't find it anymore by the Find My Mac ability provided by Apple.
So I went to the police station and gave them the stolen Mac mini's MAC addresses for Wi-Fi and Ethernet (from labels on box the stolen Mac mini originally came in). The police told me they can send a letter to all ISPs and ask them to trace all packets for the sender MAC addresses to find my Mac mini.
The First Question: Is this possible?
The Second Question: If the thief uses a Wi-Fi bundle to access the Internet (every external Wi-Fi bundle has a unique MAC address), can the police still find him/her?