Yes those are the boutiques. The SA's in The Wynn are so nice. I was there in November and going back in February. Liz and Jackie are very nice. If you are looking at something specific they can search all the boutiques.
I bought my first Chanel from Jackie at the Chanel in Wynn... she was so nice!
I haven't been back to this boutique in a few years, but I remember it had a very nice selection.