Posted 25 March 2012 - 05:00 PM
Looks legit to me...I've got several sealed AMT kits from that era, the wrap on each of them looks similar to that one. I've had a couple of them since the early Seventies, and a couple others bought from a reliable collector/seller (bought two of the same kit, both wrapped; opened one and it was "right"). Others were found for less than the price of a (then) current production kit, so I'm pretty sure nobody would go to any great length to do anything to those.
One or two of mine are split along the seam on one side of the box, but they were that way prior to my getting them. AMT started shrinkwrapping their kits in late '66 with the 1967 annuals. Trophy Series kits were "phased in"; they generally stayed with the little pieces of tape on each side of the box, and were changed to shrinkwrap next time the kit was issued with different box art.
Yellowing, excessive shrinking that pulls the top of the box into a "concave" shape, and drying/splitting of shrinkwrap are caused by storage conditions. If the box was sitting in an attic or other place with temp/humidity extremes, it would develop any or all of these conditions. The Chevelle kit was probably stored under optimal conditions over the years.
That said, I've never spent that much on a kit, and if I were to do so, I'd have to see it "in person" beforehand. I've seen too many shrinkwrapped kits with stickers, writing, paint spots, and other issues under the shrinkwrap, as well as shrinkwrapped pre-'67 AMT kits, to trust anything but a hands-on inspection. A period store price tag would be a plus, though sometimes you don't want to see that on the top face of the box lid.