Intel made the change from having the pins on the CPU to moving them to the motherboard. Socket 775, 1156, 1366 are all like that (LGA sockets).
If your brother bought that MB from NewEgg, you would have got a new board sent to you. Sometimes you can't always buy the best deal (NewEgg is usually great price). Research the return/warranty policy for the buyer you get your shit from. You can avoid problems like this.
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Never argue with an idiot. They drag you down to their level and then beat you with experience.