Yep alternator is missing
You can see in this pic
The bottom bracket is there - the top bracket is there - the big power cable with the O-ring on the end is the mains feed from the alternator - and the wires going nowhere also should go to the alternator
You need the bottom bolt, to bolt, alternator, belt etc...
But as said that same belt runs the water pump so if you drive it much it will overheat and the head gasket will go bang pretty quickly
You wouldn't have a PAS pump as it's electric on those cars
I guess the alternator packed up, the guy took it off to replace it and then gave you the car