What version was my i9305 originally?

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http://forum.xda-developers.com – Hi Ive searched for ages but cant find an answer to this seemingly simple question. I just purchased a i9305 which I'm trying to return to stock ROM. Problem is I've no idea what the original ROM was. The phone came with a modified rom and even though I can reset the flash counter and get it to say Samsung official ROM in ODIN, however it always says "sytem status:Modified." Also in About>status it always says modifed-even with stock rom. Cant get hold of the seller atm so I'm asking if theres a way to tell what the inherent stock rom of the phone is-not just the rom version I (HowTos)