NEW YORK — Casino chips have no inherent value outside of the gambling venues that issue them. They are meant to be exchanged for cash under that roof, on the spot. Sometimes, though, people take casino chips home as souvenirs or forget to cash them in. The casinos themselves might be thoroughly transformed or long since bulldozed, but their chips might not be worthless. The collecting and resale of casino chips is big business. Some vintage chips that bear the livery of defunct casinos or have eye-catching graphics (or both) bring hundreds of dollars each, with a few individual pieces selling for several thousand and the scarcest examples breaking the five-figure mark. While it doesn’t happen every day, casino chips can achieve sums well in excess of their face value.