Try offering a small, live rodent (something 1/2-3/4 the size of the snakes girth, they can take much larger but I wouldn't recommend it since the snake was recently involved in an accident and may have unseen injury). Make sure to supervise the entire feeding, as a rodent bite can seriously injure a snake (even fatally), and you need to be ready to step in in the event that anything happens (nails scraping, teeth biting, etc). Also, one week is nothing for a snake. They can go months and months without food in most cases, so don't worry if he doesn't start feeding right away. Good luck with him