this has been explained over 100 times,you get it from the high luck jobs,although part 3 is a mystery to whom haven't had a clue which job gives it,but only 2%or at least a tiny more have all of the pieces and unlocked a very special quest which gives you the best weapon in the game,Hernando's sword,now that ive told you,try to get the 3 of the notes and we will see whos the best in The West