I've seen them use a machine that can see underneath "new inc" and I assume if they see a genuine auto underneath its fine. Enhancing devalues an auto but unless it's a terrible attempt that distorts the original auto, I'd still want say a ruth enhanced ball.
Fwiw in the future there will be old enough forgeries (if not now) that people will "enhance". Here's a video for reference
https://m.youtube.com/watch?v=7mdOdTp7b28