As the other comment says, the cans would never crush flat before the piano starts to deform at all. Then when the front of the piano comes open, a pile of all the dampers just falls out, despite that area not being touched yet. It's all done to look exciting but not realistic.
Like the paint cans exploding over the piano:
https://youtu.be/ntjkwIXWtrc?si=N6QWwagucRyKp40P&t=20