Your snake will likely regorge the wood chip on its own, but a trip to the vet is not out of the question. I don't think a chip the size of a pinky can be passed through the GI tract f a small corn, but it has to come out one way or the other. So, I would look for a regurge soon.
If that does take place, you'll need to give your corn a week to ten days to recover its stomach acids before it is ready to be fed again. Please, if you get the chance to continue to take care of your little charge, please don't feed it in its substrate. Snakes are not overly bright sometimes, and if something smells of food, especially once they're in "feeding mode," it is a near guarantee that the snake will try to eat that object.
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Darin Chappell
Hillbilly Herps
PO Box 254
Rogersville, MO 65742