Tracking is expensive and it is unlikely that the seller used it.
China Post is the Chinese Post Office. If that was used your item will be delivered by Canada Post.
International Express seems to be a generic term for "fast shipping" with the actual shipping company left unexplained by the seller to allow him flexibility.
In any case, tracking is irrelevant to a buyer.
If the item does not arrive within 30 days of the end of transaction, contact the seller again and ask for date of shipping, whether it was sent Air Mail, name of shipper, and on general principles, the tracking number.
If the seller offers a replacement, do NOT accept, ask for a refund of your money. These offers are sketchey at best, and a scam at worst.
If the seller does not offer the refund, open an Item Not Received Dispute and get your money back that way.