I think you are right. After looking at mine this evening I think we have white Muscovy. The pale beaks that are tipped down at the end. Mine have longer claws, and have been making the Muscovy purring sound. So very exciting. They both were the same size at first but now one is much larger...
I live in Ohio and just purchased two from TSC last Saturday. They too were mystery ducklings :) They look like Pekins however have brown spots on their heads. TSC said no Pekins were in that mystery group. So I am stumped....and my research has gotten me no where. Guess its a waiting game now. Boo