Just bought the guts of a computer from a friend, and I'm having trouble finding the CPU on it. I think the little grey square in the picture might be it, but I'm not sure.

Front view:


Back view:


This is what it looked like on the motherboard:




It seems too thin to be a CPU:


Is that the CPU? There's nothing else on there that even closely resembles a CPU

Second question:

Also included in the load were these:


Are they all the same when it comes to pricing?