Buying any armor (Except the class item) from the spoils chest at the end of Salvation's Edge doesn't reward the armor and instead just wastes your spoils. In the video I buy 3 class items which worked fine, and then 3 chest pieces which gives me nothing, but still takes my spoils. Got back to 240 spoils and did another master witness, bought one piece of each armor and only received the class item, all the other pieces just took my spoils.