Consider this... It was never copper to begin with but just a painted facade to look like copper. They didn't do everything exact you know. I don't know but the patina on the current roof tells me that it isn't copper at all and never was. This would be good because it will give us a whole new topic to talk about how awful Disney has become (even though that happened back during the time everyone now considers the golden time), or how Walt is spinning in his grave or how maintenance has let down and not made the copper naturally oxidize properly.