Ok, after doing some research and
assuming the ship is to arrive in port on Oct 11(ish) as TI (AND in Vancouver) has stated we can do some elimination.
There are four ports in the Vancouver area dealing with cargo shipments:
Centerm:
https://www.dpworld.ca/client-centre/vessel-berth/
Deltaport:
http://webservices.globalterminalscanada.com/sites/default/files/DPVesselSchedule.pdf
Fraser Surrey:
http://www4.fsd.bc.ca/cms2/vs_limited.asp
Vanterm:
http://webservices.globalterminalscanada.com/sites/default/files/VTVesselSchedule.pdf
So given all these ports the only ones that are estimated/scheduled on Oct 10th/11th to arrive in a port are:
Arriving at Centerm's Port
Maersk Semakau 741 (MSEM741W)
http://www.marinetraffic.com/en/ais...:9315252/mmsi:565485000/vessel:MAERSK SEMAKAU
Xin Fei Zhou 036 (XIFZ036W)
http://www.marinetraffic.com/en/ais...mo:9337937/mmsi:413171000/vessel:XIN FEI ZHOU
Arriving at Deltaport
Great Bonus 5
http://www.marinetraffic.com/en/ais...584/mmsi:477995833/imo:0/vessel:GREAT_BONUS_5
Arriving at Vanterm
APL SOUTHAMPTON
http://www.marinetraffic.com/en/ais...9462017/mmsi:566409000/vessel:APL SOUTHAMPTON
No arrivals scheduled in Surrey Fraser Port at this time.
It is probably on one of these 4 ships. Great Bonus 5 is probably not going to make it soon enough to meet the Oct 11ish time frame, I am not sure if I got ship right.
The APL has to make a stop in the USA before hitting Canada, I think it would also be out (I don't know if they can have it on the ship with the Chinese arms embargo).
That leaves the XIN FEI ZHOU and the MAERSK SEMAKAU.
The Maersk Semaku is coming from Korea, I don't know its previous port but is officially due to unload on Oct 11 and it is flying a Singapore flag.
The Xin Fei Zhou is more interesting it is due to unload on Oct 12, it is flying a
Chinese flag and appears to be holding around Prince Rupert since Oct 4th, it just keeps going around in circles and its a direct trip from Shanghai, China and due to unload in Vancouver after Prince Rupert.
My bet is its on one of those two ships.^ Probably the Xin Fei Zhou would be my guess. The only other thing to narrow it down is to see if arms can be transferred on ships that don't fly the country's flag that sending the arms.
EDIT:
Arriving Prince Rupert Port:
http://www.rupertport.com/operations/schedule
CSCL OCEANIA
http://www.marinetraffic.com/en/ais/details/ships/shipid:685045/mmsi:477020300/vessel:CSCL%20OCEANIA
CSCL SOUTH CHINA SEA
http://www.marinetraffic.com/en/ais/details/ships/shipid:1014047/imo:9645920/mmsi:477637600/vessel:CSCL%20SOUTH%20CHINA%20SEA
P.S. Oh crap, I have a trip tomorrow and I spent 2 hours writing and researching this and now I'm going to be tired travelling through Toronto. I hope someone finds this interesting because now I'm behind on packing. :/