When I had mine he was in my closet on the top shelf in a open puzzle box. The second time he was in my cats scratch post in the hole were the cats climb into. That time I didn't even know till he struck at one of the cats. I would double triple check the entire house and look carefully they are masters at hiding and staying hidden. Do you think he squeezed under your front door? If they can fit their head thru the smallest gap they can squeeze their body thru too. Mine was 5" in diameter and he could squeeze in a hole the size of a quarter.
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