This is a guess...we haven't found any references to individual cards from the Z23 computer.
However, only 98 of these computers were made so it is likely that items from the Z23 are exceedingly rare.
We know of two Z23 restored computers that still exist. One is in the Stadt-und Kreisgeschichtlichen Museum in Hünfeld, Germany. The second was restored by the Konrad Zuse Schule (Konrad Zuse School, which is a vocational school) in Hünfeld, Germany and was delivered to the Computer History Museum (CHM) in Mountain View, California. However, we could not find any pics of the computer on the CHM website.
There is a report of a third machine at the Fraunhofer Institute for Experimental Software Engineering in Kaiserslautern, Germany.