Like Titus said some of them go off food for up to 2 months at a time. By looking at her/him? does it look like the snake has lost any weight or bidy mass since you got it? If not then it probably will be fine for a couple of weeks more. I would just continue offering it food every 4-5 days. If it does not eat and looks like it is losing weight, then you need to get it to a vet. A trip to the vet should be in the works anyway(if you have not already done it) for a wellness check-up and a fecal float if nothing else, to insure that there are no parasites you have to battle that may be the reason for it not eating.