Does the course number matter?
Anyone who cares what these courses are will know what a Special Topics course is, i.e. that it's a course placeholder in the scheduling and reservation system for courses that may be taught infrequently or even once, and ask you about the topic(s). This is a very common construct at universities in the US that I am familiar with, and shouldn't be a problem for you since you will have an opportunity to tell them what the topics were.