I would assume the lid goes farthest because it is designed to separate and it is much more aerodynamic than the twisted other parts.
As soon as the pot underwent mechanical deformation I bet the lid separated cleanly and went off like a rocket.
I hate to get all dry and clinical during this terrible event.
This is a common thing in geology. They know the mass of a rock and how high it is so therefore you can reverse out the minimum speed the rock was going to get at that height such as after a land slide. It is simple physics with energy and velocity.
If you know the weight (mass) of the lid and its height above ground then you know the minimum velocity and energy at launch. Take that minimum number times 2 to get what the energy probably was.