I was concerned my recently acquired youngster (270g) had an RI. I noticed what seemed to be wheezing/sneezing noise along with a little glass rubbing here or there, but I did also notice what appeared to be some stuck shed on her nose.
I have had her for over a month now, she has eaten a few times for me, and has shed a complete shed. There is no more wheezing/sneezing sounds.
Has he/she eaten for you? Usually a sick snake wont eat. I have never dealt with an RI, but from what I have heard they get worse pretty quickly (mucus in the nose/mouth, and rubbing their nose on the tank...you will see mucus on the tank).
Keep your eye on it. It could just be the shed process. Increase the humidity to at least 60%...aim for the "perfect" shed (all in one piece). If he/she is still making weird noises (and will probably be mucus-y by then) get it to a vet.
Best of luck!