Oh they have been convicted yet, just indicted

The investigation revealed that the defendants and others used the business to exchange food stamps and WIC coupons for cash and other unauthorized items, including beer and cigarettes. The men also purchased customer food stamp cards and used them at other grocery locations to purchase inventory for the market and for their own personal use, according to the indictment.
Three NE Ohio men charged with food stamp fraud at convenience stores | cleveland.com

sounds like they gave people cash and kept the card