Not eating right away is not abnormal, however follow the above advice and wait to feed/touch/change hides etc. Also, petsmart is not well known for their 'healthy' animals. Most are underfed, have parasites, are ill, and are highly stressed. I know that my local shops feed pinky mice, which the snake may not even realize is food. Once its settled in, get a weight so you know what size prey to buy. Also, if the refusal continues it could very easily be husbandry related, so a description of your set up will help.
Also is the same petsmart that sold you the very neurologic sick snake? I really hope you threw out everything possible and disinfected the rest thoroughly before getting this new one.