The Round File

What is the word origin for 'File 13'?
e.g. You're talking about the File 13.

File 13 means the office trash can. "We'll put this document in File 13." I am guessing that "13" is used because it is an unlucky number.

Also called "the round file" because round is a popular shape for trash cans. Even though trash cans can be rectangular, just about the only thing in an office that's round is the trash can.

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