2 krowaz items +11 rebirth where upgraded legit. the MS was supposedly upgraded legit aswell. there's a couple HB+9 (or reverse+11) dunno about those.
1 other krowaz staff +9 was an award for some event. the trial and ron set+9 where sent from anothe server when there was the letter bug according to the GMS. those probably re staying forever.
the chitins and crimson+21 rebirth are indeed illegal
its still not like other servers the amount of high class ites are insane levels is ridiculous. but yeah it sucks that there are illegal items around