That is what I would probably do. I know a lot of people are leery of that, as excepting a package can get you in hot water. For the sake of the animal, and to try and give the shipper their just desserts, I would do it. As soon as I found out, I would go to the PO and ask to talk to the postmaster. If they let me know before it arrived, say they sent an e-mail or called saying, "here is the tracking number, it's already sent" I would tell the postmaster that I ordered a snake, it's suppose to arrive tomorrow, and SPECIFICALLY requested it not be sent via USPS. I would bring copies of e-mails with me to "prove" my side of the story, and also to show that I informed the sender that the reason I was specifying no USPS, was that it is illegal. If the mailcarrier showed up at my door with a package, hopefully it would "click" that wait a minute this is probably the snakes I ordered, and I would quickly explain right on the spot the situation, and let them know that not accepting it may be a death sentence, and go from there. Hopefully, I would not catch any heat in that kind of situation.