Agree with them being useless, they know even less than the average person in this thread and even sometimes lie. The notes are the only source of truth.
It’s probably better to order notes from CBSA as soon as possible to know what’s going on. Although it probably doesn’t help, my conclusion is they just missed some people in the background event.
The only thing in common among all of us seems to be Vancouver primary office and Sydney secondary office. Judging from the lack of an assigned officer to my application, they might have a personnel problem or even forgot about us.