I sold a 96% one three years ago without a box for 1600. I would guess in excess of $2000.. I am sure someone with more knowledge will give a better answer.
Maroon can be correct, it depends on when the gun was made.
I have one I bought 2 or 3 years ago. It is is a blue box marked and "correct" for the gun, but I suspect it isn't the original box. Gun looks like new. I paid $1,200.