Nope, you would have a hard time finding the person(s).
It may very well be some who lives close but it could be a person passing by, who knows.
If you were able to locate the person or persons that did access his network then what are you going to do about it?
Lets say the you went to the police and give them the info, are they really going to go to any real length to investigate? You will probably get the same old line of "not enough evidence" or "not enough police office".