A multi-million-dollar Rodin bust of Napoleon was discovered hiding in plain sight — inside a New Jersey borough hall, officials said Friday. The 1908 sculpture by the French artist Auguste Rodin, which art experts lost track of in the 1930s, was found in a corner of Morris County borough hall in Madison, city officials and art experts said. It had been sitting there for nearly 85 years, Madison Mayor Robert Conley told The Post.