A necropsy can be expensive. With the clear signs of a RI, I don't see the point. Unless this was an expensive snake and you wish to prove that you deserve a refund, but i don't see LLL selling expensive snakes. Because of the time between receiving and vet diagnosis I'm thinking your just gonna have to eat the loss. If i was you i would post some pics of your setup and make sure its dialed in and then like i said before get a healthy snake from a really good breeder. Check the Board of Inquiry over on fauna first.