Here it is. Looks like Knife Rights was trying to invalidate the entire law and the 2nd circuit said we are not willing to go that far. However it is possible that they could have won if they had made a as applied challenge.
https://kniferights.org/wp-content/uploads/2018/06/2nd_Circuit_Opinion_06222018.pdf
https://kniferights.org/wp-content/uploads/2018/06/2nd_Circuit_Opinion_06222018.pdf