Walkthrough for Exhuming and Other Fine Hobbies of Red Dead Redemption.
1. Find Seth marked with S in the Map.
2. Mount up and follow Seth.
3. Steal the horse in front of you and run away from the deputies.
4. You can't kill them otherwise the mission will fail. Your only option is to run away from their radar until your wanted disappears.
Tip: If you are having hard time running away from the deputies, after having as much possible distance from them, get off the horse and run. Since they can only come after you through the road, you can go off road and run away from them faster.
5. After losing your wanted level, come back to Seth marked with Blue Dot in the Map.
6. Follow Moses and catch him with the rope.
7. Tie him up and get back to Seth.
8. Follow Seth and talk with the guy in front of you.