Adjusting kitties

I have been very impressed - the first thing the kitties did was use their litter box.  When we opened their carrier last evening, we placed it next to the litter box and left the room with the light off.  The cats were able to explore the room and understand where everything was without being too afraid.

But after that, both kitties have been laying together under one of our beds.  It's become a hiding spot for them; we've put water and food under the bed to make them as comfortable as possible.  It would be so nice for them to be comfortable with us and their new home right-off-the-bat, but this is typical behaviour for kittens.  I am thinking that the kittens are especially shy because they came from a cattery that they were very attached to.