Snake not eating

[discgolfer37]

I have recently bought a Nelson's Milk Snake for my son and it is not eating. We have had it for about 2 weeks now and the breeder who I bought it from said the last time it ate before I received it was 8 days ago, so in total it has been around 3 weeks since the snake has eaten. We are trying to give it thawed pinky mice but have been unsuccessful. We have tried braining it, putting the snake in a smaller container, etc. Any help would be appreciated