I bet they just had an assortment of really nice egg layers. No matter what you have, they'll be very nice chickens. I have my favorite breeds, like anyone does, but to me, they're a little like dogs. I really like all of them!
If you want to, you can look at chick pictures over at feathersite and try to guess breeds. Or you can wait until they develop more and guess. I'm sure everyone would love to guess here, if you post pictures of them, too.
Aren't they just the cutest at that age???