I need a legal reason to get those files without saying I saw those files.

我需要一个合法的理由去拿到那些文件但不能说我已经看过了那些文件。

He did this so that nobody but I saw the file; and when he had done it he wiped the file and put it in a breast-pocket.

他这样做，所以没有人，但我看到了文件：当他做了，他擦了擦文件，并把它放在一个乳房口袋。