Ok seriously though this makes me think of when something like this happened in our household. We had a couple of sugar gliders for pets (one was a great pet, the other was a demon from hell, but that is another story). The demon from hell sugar glider got away once and was gone, just like that. It happened in the garage and we never were able to find it. They climb like a son of a bitch and are super fast so good luck getting them back if they aren't bonded to you like the other one was. Sometimes I think someone will find it like you found this little dude, but a sugar glider will NOT look like anything most people have ever seen, especially shriveled up like that. Here is a generic picture of one if you have never seen one: