I keep the room humidity between 35-40 degrees. Thanks for your response!

I see that there are still available new copies of these sets ; I own them all but am looking to have an extra copy of PS. Does anybody have any knowledge on if the initial 30K copies have all been purchased? I am under the impression that there hasn't been second pressings. There are also claims that WEA put stickers in some of the sets. Another question: "Does anyone have any ideas as to how to curb the degeneration of the boxes"? Mine are doing so without moving or touching them; they are just sitting on a shelf. Thanks!