It sounds like some ham-fisted goofball broke a pair of CPUs and then tried to pass them off to some unwitting buyer on eBay. I'd bet he either dropped them or tried to mash the load lever closed on the socket when he had the CPU rotated 180 degrees the wrong way in the socket. I'd guess the latter as it takes a LOT of force to break a CPU and it would be doubtful if dropping it from any sane height would be enough force. Anyway, the older pin grid array CPUs would be damaged if somebody dropped them (more likely to be damaged than a newer land grid array CPU like the Opteron 6100s) or jammed them into a socket when they were rotated improperly. The fragile part of the LGA setup is the socket itself with the nearly 2000 tiny and very fragile exposed contacts sitting in the bottom.
The fact that the metal lid does not extend to the very edges of the CPU package is completely immaterial here. It's designed to allow for higher heatsink clamping forces, not to act as a helmet for the chip when somebody decides to improperly install it.