I don't collect NBA game worn, but, I've always wondered: how do the high-end NBA collectors out there authenticate their game worn jerseys?
The NFL has grass, mud, hit marks, paint, team repairs, etc.
MLB has dirt, grass, etc. Absent of modern-day authentication, how can you tell a game worn shirt next to an issued shirt that was never worn? Can you ascertain use based on wash wear alone? Were players only issued a few jerseys back in the 80's & 90's? Photomatching has to be tough, as well.

I'm curious to hear from the NBA collectors out there.
Educate me!