Hmmm... prickly problem. You could try one of the offices a corporate officer, but I would avoid anyone with "legal" or "counsel" in their titles, as well as "risk management" etc
There are one or two with military experience.
This is not as straightforward as just corporate policy but alo touches on customer satisfaction.
You do keep us up to date on this - we are Sams club members and buy a lot of stuff from Sams and Walmart and will be very interested to see if Walmart does the right thing.