It's very clean for its price, but I wouldn't call it NIB. As far as I can see that's just some random styrofoam and not an original Model F box. And apparently the one half of the cable was wrapped around the keyboard and then just thrown in the box with the rest of the cable and plug under it, which isn't ideal for conservation also.
Edit: After looking again, I have to admit that the top piece of the styrofoam box must be for a keyboard, so it's not completely "random", but nevertheless, it's not a model f xt box like the ones I've seen.