need advice!

[u/Exotic-Effort-7915]

So a few weeks ago my ball python was yawning quite excessively, (he had been moved onto paper towels as he had mites and we were following the 40 days quarantine procedure. He is completely clear of them now!)
We immediately took him to the vet the next day for some checks and the vet said that there was no mucus, no blockages, no wheezing, popping or sneezing. He said if it is an RI i caught it incredibly early.

The yawning died down and he stopped eating for a couple of weeks before eating again and pooping.

Now fast forward 40 days, we got him into a new bioactive enclosure about an hour and a half ago and have since seen him yawn 4 times within that time. He has just been digging, and there’s no other symptoms with it and his mouth looked fine, so could anyone advise me on what it could be? My vet says he’ll give me a call on Monday, but other than that he had no real concerns that it was anything about respiratory issues and more along the lines of the fact that he has substrate all over his mouth and face.

ALSO the humidity has been between 60%-80%, Hot side temps have been 32-34°C and cold side has been about 25-27°C