Do jets breaking the sound barrier leave shredded metal on the ground?
I don't think this had anything to do with military jets breaking the sound barrier nearby; it does sound more like strips of metal recovered from chaff dispensers on the jets; countermeasures systems which eject hundreds of strips or threads made of metal foil used to thwart enemy radars.  Most likely the aircraft discharged their chaff dispensers during training exercises over the farm; you simply recovered some of the metal strips.

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