would people consider the film a culture piece
I will say that I considered the film a cultural piece and history as well.
shareNo. It's a "quest" film. How odd that you would change your query and answer your own question. Why even bother to post it then?
But the subject matter happens to revolve around something 'cultural.' The guts of the film are really more the international legal hurdles that Ms. Altman and her lawyer had to overcome in order for the artwork that was her family's be rightfully restored to her, as the last surviving member of her family.