None of the contents have been used! As you can see in the pictures, all the parts are super clean and no sign that anything has been used. All cardboard is original and in mint condition. All contents are original without even one parts clip out of place. All original parts wrapped in the original paper are underneath the bottom insert and inside the boiler with the original rubber bands! The motor is in mint condition without any sign of use.The parts cans still have the original factory tape holding the lids on. I removed the lid from the only can that the tape was loose from (see pic). All the original corrugated dividers are in mint condition. Look at the closeup of the Parachute Men. They have never been removed from the parts tray. The manual only has light creases on the binder side as if it was opened a few times, but never really used. The inner-lid label is in mint condition. There are a few scratches in the bottom of the case where the parts cans have moved around some. The only thing that detracts from the set at all is the outside of case. Although the set is 100% unused, it has been moved around quite a bit over the years. The lid has quite a few scratches and the bottom is rough, but hey, even with the scratches on the outside of the case, this is a very rare find. One of the largest sets produced by the A.C. Gilbert Company over 50 years old and in unused condition