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The pattern is wrong for it to be debris at velocity, not to mention debris should not be getting by a good, sealed air-filter assembly.
IF someone did NOT go in there with a wire brush trying to clean and caused those scratches, which I feel is very unlikely, and I have seen other plastic pieces with very similar "scratch" patterns, and assuming the part in question is injection-moulded (which I believe it is), then..........(it's just a normal part of the manufacturing process)[ http://www.plastiquarian.com/userfiles/file/plasticbook.pdf ] "A typical industrial injection moulding machine uses a screw to force the granules along a heated barrel, and when the granules become fused the screw is used as a plunger to force the polymer into the mould. The moulds are usually made from high-grade steel to withstand the forces involved and must also be highly polished to produce a very good finish on the product, as any scratches will show up in the moulded plastic surface. Because of the ability of the plastic to show even the smallest of marks very fine detail can be cut into the surface of the mould, for example in the form of trademarks, lettering or textures." "When finished properly plastics products should have a good, uniform polished surface, finished badly they just look like bits of scratched plastic."
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