Reverse Type and Print Text as Black

     I made a black box and on another layer I made the type "white" by choosing "paper". On screen it looked correct.

Then I did a preflight and chose "print text as black" because I thought the text in the rest of the doc looked better with that choice.

Problem: After printing, the text in the box came out black instead of white. What should I have done? I am using InDesign CS5 on Windows.