That's funny! I have a dead, white goose in my freezer too.
A buddy of mine I sold Turkeys to (and who is on the lookout for good feathers for me) had one get whacked by a Horned Owl.
With my whole carcasses I usually get appropriately sized freezer bag and more or less pluck the whole damn thing. I think there use for every feather on a bird. You may just have to hunt for a bit to find it