Русско-англо-русский юридический словарь

A ballot box is a temporarily sealed container, usually a square box though sometimes a tamper resistant bag, with a narrow slot in the top sufficient to accept a ballot paper in an election but which prevents anyone from accessing the votes cast until the close of the voting period. (Wikipedia)

A woman who lost a wedding ring after it slipped off her finger and dropped into a ballot box has been reunited with the precious item – thanks to Trafford Council! (Messenger Newspapers)

Keep your voting slip private, fold it and place it in the ballot box. (The Sun)