Pete.
Yeah...... that's what I'm thinkin'They look like the epoxy that holds the screens in the oil filters.
I'd be wanting to pull the oilpump and flush all those galleries, see if anything else still settin' in there. And inspect the pump.
I need to start doing this now so I can keep track of how many trips I can get out of a gasket!Have you thought about carving a notch on your handgrip for every time the right cover is pulled?