The phrase transcendental object occurs once in the second Analogy and twice in the Note on amphiboly.
This, it may be noted, is in keeping with the passages above quoted from the section on amphiboly.
Passages which expound it in this later form occur in the Note on amphiboly and throughout the Dialectic.
From the first reference in the Note on amphiboly no definite conclusions can be drawn.
The Note on amphiboly was too unsatisfactory as a whole to encourage Kant to improve upon it in detail.