How much would a new in box colt python sell for?

There is really no way to tell if a gun is truly "new in the box" only that it "appears" to be so. No scratching or holster wear is a good sign but that's no guarantee. That's about the going price for a Python I'm sure it was blue because the high polish stainless ones are the ones that go for big bucks. The 4 inch model seems to go for the least with the 2 1/2" getting the premium. Ugly used ones go for $800 all the time.