You actually can though not recommended to go this route as it’s time consuming. The account will be closed out then the money sent to the state. You can search for it on your state’s unclaimed funds site. Same happens for uncashed paychecks etc. It goes to the state and they have to hold it for a long time. My fiancé just did this for an old (5 years) uncashed paycheck he found. Just a few hundred dollars. The state had the funds. He had a bit of money from an old 401k as well and tracked it back to his old company and got that reissued as well. If they owe you they owe you. Their debt to you doesn’t disappear just because it’s unclaimed until a ton of time has passed. Decades but depends on the state.