Lol. This seems to be a thing that new kittens do. Mine got stuck inside of a mattress three days after we adopted her (there was apparently a small hole on the bottom that she could crawl through, but as soon as she was inside her weight pulled the fabric down and closed the hole) and my brother’s managed to find his way into the inner workings of a dishwasher- fortunately he was discovered before they ran it but I have no idea how he got in (or out) of there. I’m glad everything ended well for your cat and family. I’m sure hat your house will recover.