The only time I have ever received snakes DEAD, they were shipped via UPS in a box marked only 'Perishable'. Apparently they sat somewhere on hot pavement or a hot truck floor for too long. It was a horrible experience that I avoid repeating. Unfortunately, I was never told how the animals were being shipped to me. On at least one occasion since then, when I SPECIFICALLY requested the animals be sent correctly labeled, they arrived NOT correctly labeled.
You folks who think they will mistreat your package if you mark it containing live animals, or that they will not treat it more carefully, are simply wrong. People of that caliber are relatively rare. Failing to label is more hazardous--and it's ILLEGAL!!!!
I'm really sick of seeing this over and over again in the industry. I will NOT buy from someone who refuses proper labeling, and if they lie to me about it, I will NOT buy from them ever again. And others should do the same! These people need to learn that this is unacceptable behavior--it's bad for the hobby, it's bad for the animals, and oh yeah...it's bad for the customer, whom you are making into a criminal!
As for the person asking what they're supposed to do, when UPS won't accept a package marked as containing snakes--you can use SYR. Or you can go through the process to become Fed Ex certified to ship live reptiles. Both options are legal. NO, I have never in my life shipped ANYTHING with mislabeled contents, nor will I ever do so. Everyone is NOT doing it. It is not justifiable.