Find my iPhone

There was an iPhone left at my work about 6 months ago. We have done everything that we could to try to figure out who it belong to. After a while the phones service was cut. It has sat at our work place for the past 4 months. I recently asked if I could take it with the time that had past with no one coming to claim it. When I got it home I saw that it was tied to a find my iPhone account. Is there anything I can do to get the iPhone up and working if the owner is unavailable or unknown?