Pieces of steel in cylinder??

Were they in all cylinders? That is certainly weird. I agree on the comment about pissing someone off. Were you running / driving it with open headers or no exhaust? Do you have any anal neighbors?

Can you file an insurance claim?

Any of the neighbors I can think of that wouldn’t like this sort of thing, wouldn’t know how to sabotage a car like this. And I’ll look into the insurance bit. Thanks