I think it is impossible to say based on these photos.
If it has a good interior--usable dash, center console (and the car is stick), door cards, window motors, manual regulators for the front (they have value), tail light lenses, sun visors, etc, etc, you get the idea. Even if it is a complete rust bucket and unrestorable, you could salvage 2500 out of it.
If it truly is as they say, I would pay 4500, but I would need 100 pix to confirm, or see the car in person.
Would also like to see his treasure trove of parts
Scott