Four postal workers were busted Wednesday for stealing more than 1,000 credit cards from mail they were supposed to deliver that were ultimately used to bankroll high-end spending sprees, prosecutors announced. A total of seven defendants operated a complicated scheme from 2017 to 2019 spearheaded by Michael Richards, 37, who recruited USPS workers to steal cards from their routes in Manhattan and Brooklyn — and as far away as Burke, Va. — that Richards then used to ring up about $750,000 in purchases, prosecutors said.