There is no evidence of drug delivery.
This type of ship has served as the 'mother ship' for smaller rubber craft used for the actual landings. The drug sold is amphetamine, (through the Yakuza which are in cahoots with Pyongyang).
One item in your favor in your observation is that the craft did depart the port city of Nanpo on the west coast (which is primarily DPRK military and not the east coast ports traditionally used by agent craft under the orders of the Korean Workers' Party (KWP).
Deputy Cabinet Chief Secretary Abe said today that based on what items were floating around that were recoverd (about 150 items) it is strongly suspected it was carrying or dealing with
amphetamines ('kaku seizai'). Also he stated that they are not going to look the other way on this, but when the evidence is in, they are going to SPECIFICALLY NAME THE NATION THAT SENT THIS SHIP.
The DPRK are not going to like this; they are already starting to growl like the dogs they are through their KCNA news service.....