You've got the goods. It's just that you don't want anyone to know where you've stashed them. Your practice with tight spaces means you ignore the penalty to move or act in a slagged square. You get a free reroll when operating, upgrading, installing, uninstalling, or repairing the Cargo Bay or any Cargo Bay item other than a fighter.
In the How Much For Your Planet? campaign, you will always have an additional cargo available at each port, but it will be contraband.