Looks like possibly some wire cut off the weight is about right and box looks full but offering at discount for unknown.

The 56918945 Category 6 Blue Cable is a high-quality networking cable designed for indoor use. With a data transfer rate of 100.0, this Ethernet cable is compatible with PCs and other communication devices. The cable is made of copper, ensuring reliable performance, and measures 500 feet in length. It is suitable for networking purposes and meets Cat 6 Ethernet cable specifications. The cable is packaged in dimensions of 13.5x13.0x8.75 inches and weighs 13.8 pounds. The connector type is RJ45, and the cable features 4 pairs of wires for optimal data transmission.