KRMQQ
You say the flights were definitely cancelled. Do you say that because on the airport displays it had the word " Cancelled" next to these Flight numbers, or because you know people booked on the flight or scheduled to operate these flights and they were told the flights were cancelled.
The reason I ask is, Toronto is CX829 and Vancouver is CX889 and 837. I suspect the flight numbers you quoted 839/825/7 are flights we used to run, but recently dropped from the schedule. CX885 is not a daily service.
By any chance did you notice this on a Sat, Mon, Weds or Thurs?