I would advise caution, if you end up beating the local, and losing to a book where you have cash posted up, you could have a problem. Say the local realizes his mistake, and says you have no bet, now you are out the money bet at the post up shop, and have no real recourse with the local, no forums, or gaming boards etc. to help you getting paid. Do what you think is best, but you could be asking for trouble betting into an obvious bad line.
FWIW. wil.