Had Roger Ma not happened to check an old account, he may never have noticed that he and his wife were missing cash that was rightfully theirs. In March, a couple of months after his wife left her job at Amazon, Ma, a certified financial planner in Washington, D.C., says he randomly logged into her old workplace 401(k) account. They'd rolled the account over to an individual retirement account in February, and yet, there was a pile of money sitting in it. It turned out, her employer's matching