"They had copies of the writings, but were they put in a fixed order and established as complete Scripture?"
Good question. I'm sure the fixed order is not that critical since they were probably smart enough to put the epistles together, the gospels together, the Hebrew scriptures together in some logical order. But as to whether all or any of the patriarchs had all the scriptures, I don't know. Perhaps a study of their extant writings would indicate what they had, but would also not rule out what they had but just did not quote from.