By the response I would guess they did not understand your?
There is no annual limit on waterfowl either it is only that the possession limit includes what you have at your residence. It is actually common in other provinces outside of BC to have your possession limit include what you have in your residence for small game/waterfowl/fish. With waterfowl being managed federal I would not be surprised it was an agreement to apply this in all provs but it’s only a guess
Grouse have the standard BC possession limit that doesn’t include what is at your residence