Pueblan milk snake won't eat

[cwdiel]

I purchased a small (about a foot in length) Pueblan milk snake on Jan.4. I have him in a small plastic enclosure with a hide box and a water dish. The temp is about 80-82 in the day and 70-72 at night. I have tried feeding him f/t pinky mice every week with no success. I have tried "braining" and leaving him in a cup with the lid on overnight with the mouse, but no luck and he still hasn't eaten. any help would be greatly appreciated. Thanks!