Material relating to Dion Boucicault's possible employment at the Guinness Brewery, Dublin, in 1840; this correspondence material is marked "confidential" and will be sealed until 2010, when the status will be reviewed. Material relating to Dion Boucicault's possible employment at the Guinness Brewery, Dublin, in 1840; this correspondence material is marked "confidential" and will be sealed until 2010, when the status will be reviewed. 1840-1984