I had previously read that Emma Stone said that she was given her Best Actress card as a memento from DiCaprio, and had it on her person when the Best Picture category was announced. So the story refuted that possibility, until it came to light this morning that Price Waterhouse has said they gave a duplicate envelope to Beatty and Dunaway.
It that is what occurred, then that's what happened.
But none of that will disabuse me of the notion that Moonlight winning was because of Hollywood affirmative action and a response to the black protests that the Oscar winners were "too white" last year.
You could be right.