this is just my opinion, but i would never have a puppy shipped to me unless i KNEW i was dealing with a legit breeder. (i personally knew someone that got a pup from them if you search on this and other sites, there are soooooooo many scammers out there that have a similar story to you...sweet, answers questions, then when they have the money, they treat you like a bother. i have heard it go as far as the people NEVER receiving a puppy, or receiving one that is obviously not the pictures they were sent with tons of health problems. (anyone can find cute pictures of puppies on the net and send them to someone saying that it is the puppy you are buying or have multiple email addresses set up to give out testimonials...etc.) then in the end, the "breeders" disapear. most of the time they get the puppies from puppymills and send then to you.
I really hope that this is NOT the case with your little guy and i am sending you lots of positive thoughts that your little guy is going to be happy and healthy!!! i don't want to scare you, but i just have seen similar stories soooo often and wanted you to be aware