Both of mine are cropped.....I have seen Yorkies with un-cropped tails, they are rather long and stringy looking not very attractive. I personally prefer them to be cropped and no offense to others, but I want mine to be as close to the AKC. standard as possible and that's what it calls for?
I'm sure there is also a purpose for them to be croppped? Besides just for looks? Anyway all Yorkies are cute with or without tales. I'm sure to have it done right away after they are born is the optimum time to do it, any time after that I believe would be very painful! But I do think it is kind of un-fair of the "Breeder" not to consult you (if it was possible based on the situation?)
as to your own preference? So you would have a choice in the matter? At this point in time/age I would think it is too late anyway?