The plaster had been replaced by dry wall, the pluming was redone as well as the electrical (minus a few cut cords) the furnace was shot tho.

What color did you use on the walls?

Is the wall you are removing and adding the header a bearing wall? 

Also, from what I hear, walls have been moved as well to allow more access (for example in the bathroom).

To answer your question, I became interested in real estate because I always wanted to paint my walls all different kinds of colors I know that sounds weird lol but I always wanted the freedom to do so.

There is often damage below roof valleys.Damage at trim (usually from failed sealant).Damage from miss directed from sprinklers (years of direct spray can affect many exterior wall coverings).  

Do bulk reo tapes even exist outside the walls of large REIT's or hedge funds?

What colors are your walls, is there a backsplash; color of your appliances, stainless or colored.  

You could do most of the staging yourself in the kitchen and bathrooms, such as bowls of fruit and flowers on the kitchen counter, towels, shower curtains, and wall art in the bathroom, etc.  

They are (probably) wrong to do what they're doing, and they're acting like jerks (assuming you're telling the whole story, which I reasonably assume you are), but you're going to end up banging your head against the wall if you think a lawsuit is in your best interest.