The original oil filter on my Mazda had a big sliver of metal stuck part-way though one of the entrance holes. Nothing exciting was inside that filter.
I bought the Toyota used, so didn't get to see its first filter. The first one I removed myself, when the car already had over 70k and the filter had 17,540 miles, looked good-as-new, and contained nothing visible except oil and a few tiny black (carbon?) particles barely big enough to see without a microscope.