noun
case file; dossier; all documents related to a case
Refers to the complete set of papers and documents concerning a particular matter, often used in legal, administrative, or investigative contexts.
弁護士は一件書類を裁判所に提出した。
The lawyer submitted the case file to the court.
この一件書類には、事件の全記録が含まれている。
This dossier contains all the records of the case.
Compound of 一件 (one case/matter) and 書類 (documents). The exact historical derivation is uncertain, but the meaning is transparent from its components.