I have a few snakes that make minor wheezing noises when roaming through my hands. They do this when you restrain them a little and they start to breath harder.
None are cinny or black pastel

Sounds like some of the horror stories I've heard of when taking snakes to vets, test, after test after test, for no reason imo.
Correct me if I'm wrong, but a culture would have sufficed when checking for a RI