I wouldn't call that a refutation unless it was at the same Walmart. In other words, I have no doubt that Happy did not get the bonus last summer at a regular Walmart.

On the other hand, I did get the bonus at a regular Walmart. The Walmart did have a grocery store but it wasn't necessary to use the deli (I never did); every check-out lane I used (all in the long row apparently for the entire store) resulted in a bonus and showed Grocery as the type of purchase. Perhaps the difference is whether the entire store shows Grocery as the purchase type.