^ agreed
I have a few WC snakes. Some needed chicks/quail to start eating. You might need to leave it overnight and not move around the enclosure at all.
Instead of scenting, after he's been eating more reliably, offer a chick/quail then offer a rat (or if you need to leave them overnight, leave both). Then switch to just rats after a successful times. That has worked for me.
In my experience, you may need to switch back to chicks/quail at times to get them feeding again, and it'll restart the process over. Maybe you could starve them out, but chicks/quail aren't too hard to find, so it doesn't bother me.