Wow I feel for you. I just went through almost the exact same thing the week before last. I'm just lucky there was a construction company there working on the address they tried to bring the package to. The the snakes stayed on the truck with no AC for several hours and FedEx wanted them to stay on all day. Only with the seller's help and the grace of God did the driver finally get told to meet me and when I got them they were very out of it and I'm sure would have died if on the truck any longer.
Good luck, I know you're freaking out right now. I really will be hoping for a happy outcome.