If you hit the middle of the body head to tail, and 5 in from the top it sounds like you might be lucky for a liver hit. The arrow should come out. Start by following his tracks. If there is no blood that is your best bet.(or only hope). If you have scouted your property well then maybe try looking in funnles, by creeks, or any major trails that the buck might of traveled. Don't give up. Whenever you think you've gone far enough go another 200 yrds. you never know.