The box is not mint. However, this type of box didn't survive very well as it was 'flimsy' given the weight of the toys. It's interesting to note that on the cover of the box it says it came with a spreader, but it never did (just the tractor, wagon, plow, and disk).
I find you have to be real careful if you want a mint original 806. There are so many repaints out there, and some of them done years ago that they can be harder to tell if they're original or not. I've always wanted a mint original 806 early version and a very unique farm set, and now I have both with this latest addition - enjoy!