I got a small order (you're going to be swimming in poop soup with 50 ducklings, you know!): 6 Dutch Hookbills (I ordered 5, they sent 1 extra) and 5 of what I think are Stanbridge Whites. I ordered the "Bargain Duckling Assortement", and they didn't tell me what they are! The other option is White Appleyard, but I really think they have the face of a Stanbridge White, so if you can tell the difference between yours, please post a picture so that I can be 100% sure!
That is just adorable.... so many..forget about how much poop there will be for now while they are still so tiny and enjoy them... I would love to be sitting in your brooder box right now with 57 of them running around. Im sure you will find a way to deal with the smell and poop later.
We had 2 ducklings a couple years ago and were shocked at how stinky / messy they were. We had 3 ducklings hatch a month ago and were amazed at how sticky and messy they were.