In Sea of Thieves, there are different types of chests, skulls, and commodities (pigs, chickens, gun powder barrels). When I sold my Castaway Chest to the Gold Hoarder faction, I received varying amounts. They were between 80 - 120 (roughly) gold each. I know that I received close to 800 gold for my Captain's Chest that I found the other day.
My gun powder barrel that I sold to the Merchant's faction went for about 180 gold, and my Black Plumed Chicken was about 120 gold. I also had a Disgraced Skull that sold for about 280 to the Order of the Souls.
It seems that the game chooses a random number between a certain range of values for each item, depending on how rare it is. So, what is the range of gold that I can receive from each type of chest, skull, and commodity?