Many bikes don't have magnets on the drain plugs so you would never notice that little in your oil.
A word of caution, do not over tighten the drain plug. The aluminum pan is very thin and many heavy handed people have stripped the hole out easily.
Agreed. That is nothing to worry about. That isn't even what I'd call "shavings".
You can always cut open the oil filter and take a look inside.
If it's really on your mind, put a couple thousand on the bike and send a sample out to Blackstone Labs. Google them up. They'll send you a prepaid shipping sample kit. Include your full story, concerns and the pic with your oil. They will literally tell you everything that's going on. I believe its around $25 I've done it every oil change on a 392 Charger since new along with a few friends of mine.
HEY Congratulations on scoring the Screamin Eagle. How about some pics of the scooter !