hey!
first of you can right click an case and it will open in a new tab with its number in the URL bar of your browser. Yours should be https://famicase.com/24/softs/232.html right?
second: you don’t need to prove it to us. If you got a yes and often this will be over mail or dms you will be fine. This is just a rule so the artist knows that your game is happening and is okay with it.
Hope that helped!