How did freighters steal whiskey from the story Bargain?

In the story "Bargain," freighters stole whiskey by cleverly exploiting their legitimate cargo operations. They manipulated the shipping process, hiding barrels of whiskey among legal shipments, thus evading detection by authorities. This tactic allowed them to transport large quantities of alcohol without raising suspicion. Their scheme relied on stealth and deception, ultimately enabling them to profit from the illicit trade.