Chinatown Open door to the opium den in the underground passages and look at the opium in the lab. See video of Charlie saying that the missing crate is in a warehouse. Discover the Warehouse address on the calendar. You will go to the newspaper headline which says Chinese Tong Wage War. Go to Warehouse from map in Jack's briefcase.
Warehouse Release the hand brake on the truck so that it rolls under the warehouse window.
Climb on to the truck bed and enter through warehouse window. Inside turn on a Geiger counter found in the tool box. Take the Geiger counter. Examine the crate and discover that it is empty. Now look at the crates shipping label, it shows that it was shipped aboard a Chinese freighter.