Well, we have almost nothing to go on. You haven't shown us the wear points inside. There is little to nothing on the outside of a gun that will indicate round count. Holster wear and magwell marks could just be from dry practice.
So, without seeing the breech face, chamber, barrel lugs, rail lugs, sear, bore and other internal parts, you just can't tell.
At the time of this picture, I had about 6K live rounds through this gun and close to 100K dry presses:
At the time of this picture, I had about 1,300 live rounds through this gun:
I have about 2,200 through this one:
None of them have as jacked up a mag well as the one you got from CDNN. I wonder what the previous owner was doing that caused all that damage. It's not an issue as long as the gun works, but it's still not what I'd call normal wear.