Review on LDT 1260 Diameter Tapcon 2 Inch 6 Inch by Darnell Murphy

In August I ordered three boxes of these screws for the house my wife and I are building. When I opened the third box this week, the screws were actually four inches long, not six as the label on the box indicated. It seems to me that an incorrect label was placed on the packaging at the factory. However, when I contacted the seller (three months after purchase), he immediately offered to replace the box for free. How could you reasonably expect better customer service?