Hive mind question: I have been trying to track down the origin of two settings of Roman Missal antiphons for the Ordination of Priests. I have used them, and I know I originally had them in a square-note notation; I've transcribed and accompanied them for the benefit of other organists. I got them from one of our priests, who got them from someone else, and long story short I can't find where they originated. Anyone know? I'm not seeing them in the RM itself or any appendixes; I know they are not Meinrad. I'd like to acknowledge them properly if possible. Attached here.

FYI: I paired them with my own psalm tones; I'm just asking about the antiphons.

Thanks!