I still don't think necessarily anything to worry about. Can you check them with a magnet to see if they are ferrous or not, which will give some sort of clue where they might be from.

One other easy thing you could do is run the bike for 500-600 miles and drop the oil again, making sure everything around the drain plugs and your catch-pan is spotless. Examine the oil closely and see how many particles have been washed out. Also remove/change the oil filter and break it open for examination. This will give an indication of the severity of any possible problem.

BTW - Did you change the filter when you did the oil change by any chance?

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