"He should have had Soult shot as a lesson for the looting. That even by French army standards of the time Soult was a cut above the rest."

I would be happy to believe you. Can you tell us where Napoléon is reported as saying this of Soult ?

The question of this thread was : from whence do we have this view of Soult as a looter?

I traced it back to the conde de Toreno writing (without eye-witnesses or archives, but with a rather full political and national bias) in about 1830.

Can we do better to really pin the title of looter on the maréchal Soult ?