Somehow I think you'd be complaining and seeing the other side of this if your package containing a live snake got dumped on your porch and some neighbour walked off with it or a wandering dog nailed it or it got left on the wrong porch. Things like that can happen, some of them in a matter of moments. No snake deserves being left unattended like that. To my mind, that's irresponsible behaviour.
Also as a breeder how would you be able to confirm your customer who says the snake arrived dead because you did something wrong had in fact left the snake sitting on his porch in the blazing sun all day because a signature wasn't required? Signatures protect both sides and make sense.