Unstamped Crate of Human Souls

 is considered a common Cargo item and is considered contraband in London.

Item description
"A crate of human souls. This one has never known the tender touch of the Imperial Customs stamp. Consequently, it cannot be sold on the open market, and you'd better not be caught with it."

Interactions
 can be obtained in the A Little Proposal event in London from the Blind Bruiser.

You need to deliver this item to Mount Palmerston in order to advance the storylet.