If you have a good population of turkey vultures in your area that is also what I would be looking for. I have located 5 downed deer from public ground hunters by following where I see the vultures. I found a dead doe some one arrowed at Middle Fork State Fish and Wildlife Area a few weeks ago by following up on a turkey vultures sightings, turned out the doe was gut shot high behind the last rib with no more than 4 inches of penetration, the camo goldtip was still in her with 4 inch green and white vanes and a muzzy head.She was laying no more than 10 feet from the mowed grass path. I wouldnt of thought she would of perished from such a low penetrating shot, so dont give up keep on looking and I hope you find him.Best of luck to you Bow-Man.