GOOD LUCK !! That's the great thing about big sites like this - there is usually someone out there who can help... or has had knowledge of.... some of these questionable breeders -
I really believe it's better to be safe than sorry and going with someone with a good track record and good references is much safer in the long run....it's too easy to get hurt or scammed these days.
I wish you the very best luck finding your yorkie.