Although I have moved on to another opportunity I will reply so as not to leave this hanging.
This issue cropped up during a VDA audit from a potential customer that is a very high profile Tier one entity. We dealt with thin strip metal, predominantly Stainless Steel for the automotive industry and that inventory is stored on racks in the shipping/receiving area. That area is periodically exposed to seasonal weather changes as outside access is necessary for loading and unloading deliveries.
During my tenure with the company and after this was issue was brought up I installed recorders and then measured a test piece of product and correlated the data from the part measurements to the changes in the environment over time. The coefficient of change was negligible and since the Customer never materialized, we removed the recorder from the area and chocked it up as a learning experience.