Oh, so you choose to take the "Frigate Path" too huh?
Well I'm sorry, I think you'll need some of these. Take some more... Brother, this won't be enough. You'll need all of em'

This is just evil
You literally need more than two times of the amount required to make two full Merchant sets, and there's no efficient way to farm those, besides placing a Alt Character in each island and change between then to kill pirates. This will give you about 1.6 of these per hour + 3 if you do Okilua's Quests, and you'll need 250.

This item is unholy.

Completing one Cox Pirates' Ghost Summon Scroll quest gives Cox Pirates' Artifact (Parley Beginner) x2 or Cox Pirates' Artifact (Parley Expert) x1 or Cox Pirates' Artifact (Combat) x1 as rewards https://imgur.com/gallery/4xyLkCg