Catriona, I've often thought the same thing as well with international shipping and "lack" of tracking. But as I was explained by the postal worker, once a package leaves the country, it's no longer in their hands. I guess every country has their own tracking system, and it's not standardised. It makes sense.

So, as far as Canada Post is concerned (and likely the same for USPS), the package was sent and that's about as much as you'll get.