So you work in a city Walgreens and are shocked that they tried a scam to steal stuff? You surely should know your clientele better than that. In fact I think your manager should sit you down and have a talk with you. Always be suspicious of everyone that walks through your doors. Figure that they are there to steal right from the start and you will be a better employee. Just don’t put yourself at risk trying to stop them. It’s not worth it for what you are paid.