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The debris was inside the camera that took the image. It had nothing to do with the scans.
They say the film was hand cleaned and then scanned so I guess it must of been picked up there.
The preparation of successive positive and/or negative reproductions from an original negative and/or positive (first-generation). For example, the first positive produced from an original negative is a second-generation product; the negative made from this positive is a third-generation product; and the next positive or print from that negative is a fourth-generation product.