“Des Moines Successfully Sizes Up the Omaha Bandbox” (Headline) Nebraska State Journal, June 10, 1894, p [Richard Hershberger]
Previous earliest use (Dickson Baseball Dictionary, 3rd edition, 2009):
1899. “31 of Boston’s 37 home runs were made in their bandbox at South End.” Cincinnati Post, reprinted in The Sporting Life, November 11, 1899. [Peter Morris]