From Arizona Family news (azfamily.com) is a bit confusing journalism. If the police don't know who the owners are of the missing emu, how do they know the emu is actually missing? Perhaps the emu does not have an owner and is simply on walkabout exploring Arizona?
Moreover, the journalist says, "...missing emu who was found..." Generally speaking, emus aren't people, so saying "who" is incorrect; the journalist should have said "which". Unless the journalist believes 'emus are people too'.