Super cute: Bet opening that box was better than Christmas!
Oh, and everyone is right about the growth rate. You will REALLY notice it right around the third week when they go into hyper-growth. My oldest goslings are 5 1/2 weeks old and a bit more than half the size of their parents right now.
They actually didn't seem to become very messy until they were about two weeks old. From there, the poop factor became exponential . I had to upgrade their brooder size three times prior to putting them in the juvenile area outside.
If you give them some grit and cut up Romaine lettuce they will attack it like a pack of Velociraptors, but nice non-meat eating ones. They are really much more affectionate than any other poultry or fowl I've raised.
Have fun with them!