call your local law enforcement authority and notify them, ask for their help. provide proof of ownership when asked.
you can also inform your local acer support and ask them if they can help you. again, provide proof of ownership to verify you as the legitimate owner.
if you have some kind of gps software or lo-jack software you could try tracking it. or if you have some kind of remote desktop software, you could try connecting to it if it's connected to the internet.
it's very difficult to track using mac address. mac address depends on the device used to connect to the internet. mac addresses are easy to change. it even changes if a different kind of networking device/lan card (other than the one built into the laptop) is used to connect. imo your best way is with the law enforcement. good luck.