jesus m8 that makes the metal i got out of mine look really tame! (i managed to shred a spacer in the clutch and spread lots of really tiny flakes..)
taking the clutch cover off and inspecting the plates is really quite easy and only takes maybe 30 minutes, be careful not to mix up the order of the plates if you are taking them out
honestly they dont look that much like bits of clutch plate to me, a couple look slightly similar but im guessing they got chewed up alot before being spat out so its pretty hard to tell..
go with the simplest things first: rip that clutch open and have a gander at its condition, failing that its probably going to be your gearbox eating itself...
what are the symptoms of the bike? presumably it wasnt running too nicely before finding that lot in the oil
oh and as for panicing... you certainly dont want to run the engine until you have a good understanding of what that lot is, where it came from and most importantly WHY
generally speaking when engines chew themselves up that much a full on seizure isnt far off the horizon (if the problem is ignored anyway..) so please dont take it out for a ride lol