I tested this out and had the person I sent it to send the items back and now I can do what I want with the items such as sell or auction them. When I complete the mission if duke doesn't take the items (masks) what should I do with them? Duke did not take the masks back when I completed the mission.
Yes I wanted to expirament to see if this would work so I put the masks in the parcel shipped it to someone, they shipped it back and it gave me full control over the item, I could sell it or auction it and duke didn't take in when the mission was complete.
So now I can just sell them and become a hundred millionaire like that? Kinda seems like a cheap move, if I'm allowed to keep them I guess I'll sell them then. Thank you and sorry for the inconvenience.