My first time playing a volcano and I have an awesome metal industry going. There's a few leftover items from before my Blacksmiths hit Legendary. I've been able to melt all of them except for the brass chests. The furnace operators will take them to the smelter, work until they get hungry, thirsty, or sleepy, go take the appropriate break, return and start all over, but the item never gets melted. I have hundreds of these things and I would love to be able to melt them. Any ideas?

(Shops are not cluttered)