wolf snake issues...dying?

had a wolf snake come in the mail other day. they said he was flighty and defensive. had him for 3 days now and he seems sick. wont move at all in enclosure. very lethargic does not want to move at all. wont open its mouth even. im actually hoping it bites because to feel better about it not being sick! it may have mouth rot though not sure as usually they would open mouth if was the case and as stated, she does not open her mouth at all.the shipping was shitty box was messed up she definetly had a tough ride. any ideas would be helpful. i was excited to have her so i can help teach my son how to work with a flighty specimen. now im just bummed out that i might have a potentially dying snake.