I’m not familiar enough to say for certain but my own suspicion is that this particular cover may have been an aftermarket item and not genuine factory. My reason for thinking this is that there were no press stud fasteners or similar on it, just a sewn in Velcro strip. My own cover does have press studs and I assume is factory original. The parts book also shows press studs were fitted.
What are your covers like? With fasteners? Or just a Velcro strip? Maybe both types were supplied………?