Few things from a customer standpoint and breeder standpoint.
As far as fedex goes it pretty typical for them to leave the package at the door heck sometime they leave it at someone else's door. This is why as a customer when I receive a snake I track track the package and refresh as often as possible.
On the breeder side one of the reason breeders don't do signature is that in a lot of cases if the signature is on file, the package will be left at the door (in other words signature is useless), if the sig is not on file and the receiver goes to the bathroom or does not hear the doorbell the package goes back on the truck and is re-delivered next day.
Now paperwork as a customer, I really don't care, most hets I have received did not come with any paperwork the key is to buy from reputable breeders. As a breeder I still do paperwork for my customers to help them re-sell the animal in the future making it easy for potential customers to check that the animal was produced by me but this is not something everyone does quite the contrary and if you bought from someone reputable it should not matter.
Now as far as shipping while I understand not wanting a snake to be overheating I am having a hard time understanding using a 10 hour warmer (hand warmers are not like heat pack designed for shipping) that I would definitely have an issue with.
When temps require a heat pack I use a 40 hours heat pack, always have and never had an animal overheat.