If they were suffering from loss of feathers it is probably due to having too many males to hens or even too many birds without enough space or hiding spots. Glad you saved them.
I made the mistake of buying a female from a caged bird breeder(finches, canaries and parrots), so the buttons were used as floor cleanup and she was in such bad shape that she died from fright and cold, she was completely bald on her back, before 24 hours had gone by. I felt so bad that I promised never to keep more then a single pair in an enclosure again. Good luck with yours.