I'd be pretty shaken up, too, if somebody was sending me anonymous notes.

Do you think I ought to drop them an anonymous note?

The procedure is also commonly used when trying to determine if a specific person sent an anonymous note.

Like, even if it meant writing them anonymous note, you know!

And who was to say who had left the anonymous note?

Perhaps she ought to send an anonymous note or two to people who might do something about it.

The anonymous note left on the windshield of his car says, "Please go away."

"An anonymous note I received this morning said something interesting."

He handed me the anonymous note that had been found in his office.

"So you wrote up that anonymous note and left it on Eleanor's desk."