Couple of questions for you?

What do you mean by "in the mail", live reptiles should be shipped UPS or Fedex.

What is shipped Next Day Air?

What is the seller doing about this, have made him aware of this, has he been contacting the company used to ship your animal so they can locate where the animal is exactly?

What are his guarantees?

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It happened to me a few months back drop off an animal and next day when I check the tracking number to see where the animal was, the tracking number was not showing.

I immediately knew there was something wrong, I first contacted my customer (before he was even aware of the problem) to let him know that there was apparently a problem and that I was actively looking into this.

Turned out the snake never left the hub on my end, I retrieved it, kept him for a few days and ship him back out.