did he send you any photos of the dead snake?
vet reports? just to say it died without some kind of remorse is messed up.
save all emails about the deal those can be used as proof
either way he wouldnt have to pay you what you paid or what a het is worth now he would have to pay actual replacement costs.
i would ask for a replacement or actual $ amount for a het the same size.
oh yes and i wouldnt be hiding this persons identity