How do you find a owner of a PO box?

Since the FOI-(freedom of information) act, all you have to do is fill out a postcard at the PO, or online with your inquiry. There is a spot on there that asks if your a lawyer or something like that. Check no and put your name in there. The other person that answered this was partially right about the "Federal Government" issue he stated. BUT---The Post office is a federal agency and that "rented" po box is public property. There is nothing private about it anymore - thanks to that FOI act.