There is a scene from a Columbia recording session in the Straight No Chaser documentary where Rouse asks whether the chords he just makes up are correct. So obviously there were no chord symbols on the sheet. I must have some facsimile of a Monk sheet somewhere without chords. I will look for it. To me it makes sense. Monk wanted improvisation on the tune, not the chord changes, and he himself played just like that.
If so, he wouldn't have needed to notate changes.