The listing, old MO tax receipt token has ended.
Because cents were valuable in the Depression years of the 1930's, Some States issued sales tax tokens either in fractions of a cent or mills (1 mil=1000th of a cent). Since Sales tax would be exact and there were no fractional cents to give change, the final price of an item was rounded up and the difference paid back to the customer in sales tax tokens. These tokens could be used to pay all or part of any sales tax at the time of another purchase.