mites tend to make the scales stand up slightly when they burrow under them, so if you pick the snake up and manipulate their body so they make a bend crawling through your hands, it exaggerates the scale standing upon the outside of the bend giving you a view to where mites hide. Mites however are normally easily spotted. What isn't spotted is mite eggs. Thats why many of use make it a practice to treat all new snakes like they have mites and pretreat the cage with mite spray. Even if eggs hatch, you will already be fighting them. Also quarantine will prevent mites from becoming an outbreak, in the event they do hatch.