I would follow up with the breeder, file a lawsuit, and contact the Fish and wildlife commission, in this instance, your birds are not the only animals at risk, it is your responsibility to ensure that this incidence is not repeated and that those animals that are infected do not suffer. I understand that this undertaking may seem daunting, however it must be done. I would further consult your veterinarian and see what the opinion of the vet is regarding the matter. Would they testify, gain all records and have copies made. ect.