Proof of non-service

It is a certification that the document described in the certification was not able to be served upon a particular person as prescribed by the rules of civil procedure. They can try to re-serve the document.

"Non service file" mean, that plaintiff wasn't able to serve defendant in proper way - didn't fined in defendant's addresses (work/home) and ask a judge grant permission to do publication of summons of complained threw the news paper. And after certain numbers of publication, if defendant would not respond judgement will be issued by defoliate again defendant.
If defendant has a property, it will be in the most cases where property located (if property not under the water).
I hope it is address your question.:p