Looks like crankcase sealant that squeezed out during assembly,good thing is it came out but like mentioned i would just change the oil and recheck,what if you refilled with a cheaper oil,run it for 30 min or so and then drain and recheck?
Were the pieces hard like straw, or pliable like some sealant squeezed out into the interior and then broke off ? Does it run ok? I would definitely follow up in 5 or 10 hours with another oil and filter change. Good luck
Pop Bob