You have a comprehension problem, too.
The original poster stated:
However, most references say that icing in the intake duct cannot, or does not, occur with fuel injection sysytems
He or she has been able to say which "most references" make such a statement. Have you ever seen such a statement? I certainly have not (except here).
The original poster questioned:
Question. Is there any evidence at all out there of icing in the intake duct or manifold of fuel injected engines?
The answer is yes, there is evidence of this, which can be seen first and foremost by the fact that an alternate air source is required for injected engines.
Icing can take place at several points in the system, depending on the system, operating conditions, etc. The details of this were previously outlined.
Apparently several paragraphs has exceeded both your attention span, and that of the original poster.
This does nothing to change the fact that induction icing can and does occur, and provisions are made for it in the design of air induction systems for piston aircraft. These provisions have also been outlined. Perhaps you missed that, too.