Thanks for the question. That is interesting. Certainly all cargo on a ship is very highly documented through a ship's manifest, so I can't answer the question specifically as to why it was not shared or why it took a while to obtain that information. However, that information certainly would have been in the hands of certain Canadian agencies, namely the Canada Border Services Agency. It would have that information, as would the shipper itself.
On April 7th, 2022. See this statement in context.