My first question is whether you bought this CW new or used and what was represented to you as far as viewing screen provided in the body? Over time, bright screens were made by Beattie Intenscreens, Minolta supplied them to Hasselblad and later Zeiss made them and labeled them "Bright" which I believe is what you have there. I'm unaware of any notches on the metal frame itself. There are, howerver, notches on the left hand side of the film magazines that produce the distinctive horizontal "v" notches on the edge of the frames exposed. Notches on the focusing screen wouldn't make sense. Some of the newer bodies have notches in the viewfinder (not on the screen itself) to allow the PME to work properly.
To get a glimpse of the many acutematte or bright screens availble for Hasselblad, take a look at E-bay. And no, I don't think you were ripped off. Enjoy your 503CW. It's a great piece of equipment.
Mark