Others may want to see this thread for more information:
http://www.yorkietalk.com/forums/bre...uppy-mill.html.
To the OP, you have admitted you haven't visited the kennels, so you can't not say they aren't a puppy mill. Just because the puppies look healthy, it doesn't mean the breeding dogs are well cared for. Mills have healthy puppies all the time; otherwise they couldn't stay in business. You can talk more about your dog's health after it reaches the age of 4 when genetic illnesses are more likely known, but you cannot vouch for them not being a mill until you actually see the kennels.