If that doesn't work then I only know one more thing that could've happened.
I dont know when your group killed the boss and how long it did take for you to get to his corpse and try to loot, but in that time someone could have skinned him and then it completly bugged out for you.
Brother I got It. You made my life in wonderfull colors! I did all as you said. And got the Blood Of The Champion. It appeared, when i came in the game! God bless you and your family, man!