Welcome to the forum David, you'll find the members on here are a friendly and helpful bunch 🙂
I believe the paint is an Audi exclusive colour called pelican blue but is also known as kingfisher pearlesant Blue. I believe the paint code is LY5T.
If your car comes with the original owners service book then a similar sticker to the one in the boot can be found in the inside of the front cover.
Cheers
Steve