I grabbed the letter and have forwarded it to WalMart for comment. They have a bad habit of not responding to inquiries about vendors, so we'll see what happens.
Also note that in the first paragraph they refer to it as "Wal-Mart" whereas it's reffered to as Walmart throughout the rest of the letter. Unlikely that such a discrepancy would occur in an official doc. What a terrible scam job. Somebody is going to have some questions to answer when Walmart management gets a hold of this fake.