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Its not long broken whatever it is, can't imagine anything coming from behing the pulley its just your block. Do you have pictures of where it was pulled from?
No pictures of that but it was sat behind the crank pulley, sitting at the bottom being pinned against the pulley and the block/sump. Hence the metallic rattling noise
It looks like it was part of something that had a radius to it, something circular or semi circular. Maybe some sort of bracketery? Engine mount looks fine
All the pulleys fine? Lower arch liners fitted and so on. It looks like its broken off whatever then been caught and bent over as there looks to be stress lines in 1st and 3rd pic.