My reference to Baker was from this article:
https://www.sportslingo.com/sports-glossary/b/bandbox/The rest was either Wikipedia or Google photos but everything matched. But I won't claim the original article was correct. It did call Baker the first bandbox stadium.
Just re-read and saw this:
"The Philadelphia Inquirer coined the term "Baker Bowl" on July 11, 1923[32] after then Phillies owner William F. Baker. Baker had purchased the club in 1913 and would own the club until his death in 1930.
Built for baseball in the dead ball era, it came to be seen as inadequately cramped for the post-1920 live ball era. The ballpark was written about as "The Cigar Box" and "The Band Box", referring to the diminutive size of the outfield. After the close of the Baker Bowl, the terms "cigar box" and "bandbox" were subsequently applied to any "intimate" ballpark (like Boston's Fenway Park or Brooklyn's Ebbets Field) whose configurations were conducive to players hitting home runs.
The ballpark would also be referred to as "The Hump" in reference to the hill in center field covering the partially submerged railroad tunnel in the street beyond right field that extended through into center field. Outfielders would occasionally feel the rumblings of the trains passing underneath them."