I do believe the filter caught that material, for it was INSIDE the filter when you cut it open, only possibly mixing between the unfiltered and filtered sides when you cut it. Most of the bits were caught on the filter pleats -- right where they should be.
I don't really see any "metal sparkles" ... I think that is just light reflecting off parts of the oil soaked media. The junk in the filter looks like combustion/carbon blow-by