We just sanka galleon with a level 5 order of souls. We gained a lot of ground on them by a clever anchor turn after they pretty much respawned on top of us. We made a row boat play with all of the loot on an outpost and led them away. As soon as our friend sold one chest they anchor turned and beelined for the outpost, they 100% got the challenge that told them that we were selling their chests.
Please remove this awful challenge. It just completely cost us a huge fight that we won fair and square. We play the game in such a manner that information is very valuable and we feel the game handed that hard earned information over for free.
