yeah, that site is no good to me i'm afraid. it just parses info from the postal service, so it's the same as when i manually check my own post office track page.
either way, my post cannot track this type of package/service, it's just an international letter. that's why i'm suggesting to SP to get a different service, which will result in a higher cost (not by much though), but it will be trackable all the way.