Stolen mac

This is all anybody can ever do

https://support.apple.com/en-us/HT204756

nothing we as users can do except the site he listed may help but if that was never setup , sorry to say not much you can do, but report it stolen to your local police department in case it ever shows up in a police bust or something .

If you had Find My turned on, you can do that from your iPhone or iPad. If Find My was not turned on, there is now way it can be traced via an Apple device.