Try looking in his mouth -- tutorial here: https://www.youtube.com/watch?v=XK0Uvln4lY0
There should be no saliva visible if he's healthy, any mucus/thick saliva would indicate an RI. It could also be that he has a bit of substrate stuck in his mouth, which you would be able to see.
Try holding him up to your ear and listening, signs of RI would be clicking, popping, whistling, or wheezing, and a healthy snake should be silent.
If you do see symptoms of an RI and can't get an appointment soon enough, you could try the F10 Reptifogger method which has been said to help in treating RIs: https://www.youtube.com/watch?v=YlZ5eVaHiiI (however you should definitely still take the snake to the vet asap and not rely on this alone to treat an RI!)
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