Since the question was revived, I'll leave a comment: there is proof. First, the fact that the Orc Warlords in the raids are the same as normal Orc Warlods, meaning they don't have a special loot table. Second, by the leaked files which show that there is a small chance of an Amazon item being added to the loot during the raid, which is a one-time event that won't happen again when the creature dies and the eventual double loot is generated.