Over a four-day period, Oberg bought a total of $32,000 in gift cards from various major retailers and read the card numbers to the scammer over the phone. She said only two cashiers asked her why she was spending so much money on gift cards. And even when she bought $8,000 worth of cards at one retailer, the cashier said nothing. Download our NBC Washington app for iOS or Android to get alerts for local breaking news and weather. News4 visited seven major retailers and saw that all had signs warning about scams on their gift card displays, although some were more obvious than others. Those same retailers said they train their employees to identify red flags to spot potential fraud victims.