Designer slide🤍

I’m selling these slides, I am unsure if the authenticity, I was gifted these a few years ago and have tried to authenticate them before but never was able to come to a conclusion. They are pretty used however I believe the staining will come out with cleaner and a magic eraser. Again, I’m unsure of the authenticity, if you all know of any way for me to confirm there legitimacy please lmk. Thank you!😊