Yes, he could have gotten downstairs. My super pastel got out of his - I admit, not very secure - quarantine box. Luckily Sammy, our cat, found him and screamed up a storm (he's very protective of our snakes ... I'm not kidding!).
Tips: Crinkle paper on the floor and keep an ear open, flour dusting the floor to figure out from where he's coming/where he's going, dead rat on top of the heat mat, lots of patience and good luck!
Hope you find your escape artist soon!
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