FWIW, Job was not within the OT fold, yet he was clearly very pleasing to God. None of us can know who was or was not saved before or after the coming of Christ (outside of God telling us via some kind of revelation), but God is a just judge whose decisions are absolutely perfect. We do not need to know such things in order to play our own little parts, knowing that He alone is worthy of all honor, praise, and glory.
God is the sole, ultimate authority in any and all circumstances and times. Even now, the Church merely acts as His minister upon earth. Men cannot erase or alter the law written upon their hearts, however much they may desire to do so.