it everywhere has the tetragrammaton in the phrase ἄγγελος יהוה (angel of yhwh) instead of ἄγγελος κυρίου (angel of the lord) in zech 3:1-2, 5 and 6. the oldest example of ἄγγελος κυρίου is in p. oxy. 1166 from 3rd century, more than two centuries after lxx.