Green’s Dictionary of Slang

a box in the theatre.

1909

J. Ware Passing Eng. of the Victorian Era 10/2: Artful Fox (Music-hall, 1882). A nonsense rhyme for ‘box’ . You capture the first liker at him in a snug artful fox at some chantin ken where there’s a bona varder in serio comic, and Isle of Francer engaged. – From Biography of the Staff Bundle Courier, the gentleman who accompanies ‘seriocomics’ from music-hall to music-hall when ‘doing turns’.