Well, it's not a Chinook, but there is a CH-3E at the U.S. Air Force Museum named "Black Mariah" that is painted all black. It sports no insignia and no serial numbers, but it does have a few red "no step" stencils, as I recall. Here is the link on the Air Force Museum's official page on this aircraft:
http://www.wpafb.af.mil/museum/modern_flight/mf7.htm
If you will be a few weeks getting around to this kit, I am planning a trip to the museum the first or second weekend of January. I would be happy to take some pictures of the helo then. Let me know.
-Adam