most of those couriers, in most of the nation's markets, will not allow a person to ship snakes. therefore the snakes are shipped either labelled as something else the courier does allow, or not labelled as live at all. In either case this delivery method is being selected for the convenience of the shipper/recipient and not based on the well being of the animal.
airlines can lose packages too. but delta, for ex, probably the most-used, has animal rooms at most if not all of its facilities, and even lost packages will go into that room because they're clearly marked "live animals" or more specifically, "live snakes" plus any warnings you choose to put on the box re: avoiding heat or cold.
it's not perfect, but it's better. i'm frequently packing animals that will be in their new owners' hands 12 hrs or less after I box them. it does gripe me a little that there are people out there who cavalierly lie to get an animal into a transit system that's not in its best interest in the first place. And incidentally, you can't insure what you don't honestly identify as contents, so that's another shortcoming of those services.
If one or more of the couriers begins accepting snakes UNIFORMLY AND NATIONWIDE, so that the people handling those boxes system-wide are familiar with live animals and how to handle them, then I might endorse those services as an alternative. But under the present circumstances, I think it's a shame. People CAN get certified as known shippers with delta, i'm led to believe, if they just go to the trouble of doing the paperwork, cooperating with a site inspection, etc. Ditto for continental, whose quickpak shipments will also get live animals to their destinations on the same day they're shipped, if you plan appropriately.
peace, and good luck with the snake that was lost. even after 1 am, keith DID give you good advice on responding to the animal's needs.
terry