Fangthane
Tuck Frump!
It's a pretty contortive stretch to try to lay this entirely at the buyer's feet, or to try to make the case the it's anyone other than the seller who has shown a disregard for the welfare of the animals. Had they been left outside for an extended period of time, your statement may have had some validity. At worst, the 15 minute lapse shows nothing more than poor planning on the buyer's part.@OP: I don't know you, but since your seller shouldn't ever ship in cold weather again you shouldn't buy in temp ranges outside of 70F to 80F. You obviously have no regard for the welfare for the animal, however they are packed, and should just leave your buying to when heat or cold packs are not needed. (Just using your logic on you, is all.)
Considering the absolutely inept packaging job, I think the seller's choice to hide behind TOS is very telling. I believe that animals that are shipped spend a pretty decent amount of time outside of areas that are strictly temperature-controlled. The chosen packing method didn't appear to give much consideration to that premise. I highly doubt that that final 15 minutes outside of the truck really amounts to anything more than what that already had to endure.