I love delivery day at the nursery!
Maybe rose culture varies in other parts of the country. When I worked for a nursery, we cut very little off the roots. We used deep pots that accommodated most of the root without bending it.
We didn't cut anything off the top, either. I noticed that the California nursery I shop at left as much root and top as possible. My daughter sent me a few more from California today, and she shipped them in a rubbermaid tub! Their roots were as long as the ones from Palatine roses.
Maybe I'm worried about nothing, but if I saw roses laying out with the roots exposed even for 5 minutes, I would not buy those plants. I think they need to be kept moist in plastic or peat moss up until the moment of transfer into a pot.
Have you succeeded with their roses? Like Zuzu, I'm looking forward to seeing more photos as these roses grow.