Costco has sent warning letters to nearly 200,000 customers about possible contamination in a popular crab dip. The dip is made by Gold Coast of Naples, Fla. Costco sells it in many of its warehouse stores in the Southeast and the Northeast. Costco sent a letter to about 180,000 customers warning of the possibility of Listeria contamination. So far, Costco and the FDA said they have no reports of serious illness. A spokesperson at Costco’s corporate headquarters near Seattle said the company is not sure if it will restock Gold Coast dip in the future. If you have any of that dip left in your refrigerator, throw it out and do not eat it.