Sorry to hear that. Unfortunately there is not going to be anyway to track it since you didn't have anything installed and it would be further complicated by being wifi only. At least in phones they have a radio chip which is always pinging the towers and also a GPS to help locate them. Even then you have to enable tracking but with the Surface being wifi only the chances of locating it are even slimmer that you would have been able to find it.
thank you for suggestions and concern. I did call them gave Serial #. They couldn't do much but just flag the device as stolen. They asked me to report to police which I did already and They will be contacted thru police now. I am trying if there is a way at our side !!