I might not get it completely, but it's a Gigabyte-brand AMD board right? If so, there is no CPU cover. It's a PGA (Pin Grid Array) socket, so the pins are on the CPU. Nothing to break on the board. You could also be talking about something to cover the CPU in the socket? Usually nothing is bracing the CPU in the socket other than the heat sink you mount on top of it. As far as I can see, it's good to go if it weren't for the missing lever. Can you lock up the socket somehow? Is there any other visible damage or looseness to the socket mount?