My grandparents are driving to my house in a few weeks and are driving right by the hatchery. I am going to ask them to stop by and pick them up for me, but it is still a 2 hour drive to get to my house. What can I do to make the trip more comfortable for both the chicks and my grandparents. Do the have to have a warming pad or something near or under them or are they ok in a shipping box? Thanks so much!