Interesting experiment on engine tightness ... you may have a few surprises

[Grumpy Goat]

Earlier in its' life (aka still under warranty), the little slivers and crumbs were from valve guide material. I can only imagine the look of shock and horror on the lab assistant's face at the contents, if the oil had been analyzed at its initial 6oo mile service, lol.
55k miles and counting

Hehehe ... its getting rid of excess material. Just rev the engine up and blow it out of the tail-pipe ... its all good. At 55k miles and counting, you are ahead of the game, especially for a Ducati. Just keep flushing her out with every oil change and enjoy.