I'm really hoping AP discovered what was happening, and got really good video coverage. It's not un-common for peeps to come in and buy 4 Vizios with Fake Cash. We normally can't stop them (we can't prove there fake on the spot) but we can at-least collect good video of the people, and try to get a license plate, which is very helpful for Investigations Center.
Others love to buy Target Gift Cards, with Stolen Credit Cards, or Prepaid Debits loaded with money from fraudulent tax returns. We normally get charged back everything they buy, so if you can, alerting AP and trying to enforce "reasonable family quantities" can be a life saver...