Attention shoppers, you may be eligible to receive up to $500 from Walmart if you purchased certain groceries from the big box retailer over the past six years. But the June 5 deadline to file a claim is quickly approaching.A class action lawsuit filed in Florida claims that “Walmart uses unfair and deceptive business practices to deceivingly, misleadingly, and unjustly pilfer, to Walmart’s financial benefit, its customers’ hard-earned grocery dollars.”The lawsuit specifically alleges Walmart “falsely…