I sent an email to the factory asking about the spots and received this reply
"This is an issue we are aggressively pursuing. What you are seeing on the cases is cosmetic only in nature. When the rounds are loaded here at the facility, we do not see the staining you are seeing now. If you reload, when you run the rounds through a cleaning media, these will disappear. What is happening is that during the wash process, sometimes there is a soap film left on the case that is not fully rinsed. As the products is stored, usually under hot and humid conditions, the moisture in the air is attaching to this residue. It is essentially nothing more than what you may see in your dishwasher and spots left after the cleaning process.
Again, this is cosmetic only in nature. Try shooting some of the rounds and see how they function. If you have issues, let us know and we will get back with you."
Sounds good to me so I might try some and see for myself.