Just curious, why are the scratches only in that small section and not all over the entire top of the case? Why are they in a very staggered pattern and not smooth straight lines? I have applied window tint on hundreds of cars and house windows and BSE on several products. Window tint is the exact same process as skins. When I squeegee the liquid out, I use a straight path and work the liquid out to the edges and not random lines rubbing any direction. Yes, I have scratched window tint (specific type of dyed film or mirrored film), but again, the lines are very straight or a very small curve and not a random pattern.
Did you just rub back and forth really fast in your attempt to remove the liquid? Did you rub the credit card on the entire lid? I am not calling your integrity into question, but just curious of the details since this might be why others are.
Also, BSE can hide existing scratches depending on how deep they are. You might just want to apply again, but make sure you use straight strokes with light pressure, use a small rubber/plastic squeegee (can buy at a local hardware store) little larger than credit card and used by body shops to apply Bondo, use enough liquid to slide the position and work from the center out. Also, make sure you spray some liquid on top of the skin and the squeegee to make it glide smoothly. If it grabs, you will stretch the skin. Just spray and then wipe excess off with a paper towel once you get that section bonded.......or get someone else to do it for you.