I liked Costco's service too.
Recently my husband and I visited our local Costco. When we left, I offered to unload the cart, but my dear husband encouraged me to sit in the car while he unloaded everything. When finished, he put the cart away, and failed to notice that there were still two items in the bottom of the cart. As soon as we noticed that these items weren't in the car, we went back to Costco. We hoped that the person who brings in the carts might have noticed the items and set them aside. That had not happened; the items were gone. However, we were delighted and appreciative when Costco replaced the items (about $30 total). They did not have to do this; it was our fault for not checking the bottom of the cart. However, this type of "above and beyond the call of duty" service makes me want to shop at Costco again.