Safety storage of raw chicken

I purchased a package of boneless, skinless chicken breasts. We traveled straight home from the store (about 15 minutes). It was about 5:00 pm. Heat was on in the van but chicken was in the very back behind the seat (no direct heat). We got home and left the chicken in the van. Temperatures around 50 outside. My husband used the van that night to make a round trip to town (about 40 minutes) with heat on prior to temperatures dropping to 30's. Temperatures went down into the 30's at night. Next morning, temperatures went up to about 45. My daughter drove to town with heat on. Was driving about 40 minutes. When she got home, I was looking for chicken in freezer but couldn't find it. We checked the van and found it upright in the back of the van, in a plastic bag. It was cold to the touch and did not have any discoloration. Is it safe to use it?