So just based on what's happened for me on my DK since broken shore opened up I think the wyrmtongue chests, dauntless tokens and rare elites in broken shore add to legendary bad luck protection.
I've been running around out there a lot the past few days looting chests and killing rares for war supplies and nethershards and have gotten 3 legendaries as a result. 1 each of the past 3 days.
None of them were from the chests or tokens themselves, which I know can also drop/become legendaries but Blizzard had said they wouldn't contribute to bad luck protection so either I'm really lucky or they actually do contribute contrary to blizzard's quotes.