Imported Goods opens during Saltwater Cambozo when Cornelius Stilton asks you to inspect a marked shipment. During the mission, find the chalk cheese-wheel warehouse, clear the guards, and inspect the special crate at the back to lock in the 400 Coins reward.

How to start Imported Goods
Start Saltwater Cambozo walkthrough, then return to the P.I. Office before you commit to finishing the mission. Cornelius Stilton gives you the side job there.
Because Saltwater Cambozo also contains Fishy Business guide, it is worth planning both detours together.
Walkthrough
Reach the warehouse district
Progress through the docks until the route opens into the larger warehouse stretch.
Look for the chalk mark
The warehouse you want is the one marked with a chalk cheese-wheel symbol near the entrance. That visual marker is the easiest way to separate it from the other cargo buildings in the area.
Clear the guards and inspect the crate
Fight through the smugglers inside, then head to the back corner. The target is a smaller marked crate stacked away from the main cargo piles.
Interact with it to secure the objective.
Rewards
Imported Goods pays 400 Coins, which makes it one of the biggest coin rewards in the side-job pool.
If you are cleaning side content as it appears, this is one of the best reasons not to rush Saltwater Cambozo.
FAQ
Do you carry the crate out of the level?
No. Confirming and securing the marked crate is enough to complete the side-job objective.
Is Imported Goods missable?
Yes. Treat it as mission-bound side content during Saltwater Cambozo.