This is by no means a scientific analysis but I have some 60 Atlas switches working on my layout and on my shelves (O-54's that are not on my Layout) bought over the past 20 years. I have all the boxes. The oldest boxes I have based only on price have the orangish sticker on them and they all have that sticker. Since I am not going to remove any from my layout, I know that some do not have the beefier wiring under them. So I am not sure that the use of the sticker is a good indicator of the newer wiring. IMHO.