There is no question that casino chips are used in commerce.

Casino chips are commonly used for ..
Casino gambling
Tipping a casino employee
Making a donation in a church (at least in Vegas)
Casino chips in certain locations can be used in other casinos
Bill Borland used to pay for "evening entertainment services" with casino chips

If you difficulty with the term "commerce", just substitute in the term "business". I think it is very clear that casino chips are used in business.