Oct 2 -- Oct 5:
Originally Posted by Skydog
Not that it should make a difference, but has it been in or out of an Amazon case?
It was in my cover, shown below. I don't think I ever closed the front panel of the cover, which would have sandwiched the PW between the front and back panels. Instead, I had the front panel folded back behind the back panel leaving the front of the PW exposed.
Oct 5 -- Oct 7:
I placed the PW back in its shipping box and closed the lid. The box was not taped shut nor was the PW placed in a plastic bag* and sealed. Air circulation would have been minimum but still quite possible.
*The email instructions I received for returning the PW state to "insert the Kindle into a plastic bag..."