Here at the Consumerist we realize that return fraud is a very serious problem for retailers. Nevertheless, this story puzzles us. Dana bought a thermostat from Home Depot, but it turned out to be incompatible with her heating and cooling system. When she brought it back, the customer service person accused her of bringing in an empty bag and receipt, shoplifting a thermostat and then trying to return the stolen unit. It’s a common scam…. but…