Simple question, but did you have the oil changed recently? Very easy to make a mess if they didn't know what they were doing. All of it would drip onto the belly pans once replaced.
I would look more to see where the torex came from. Definitely the common fastner on the GT. naturally one from the belly pan would hve fallen on the ground, so needs to be a line support or somethng like that. There are not a lot of places that used a stud or a nut and bolt. Should be easy to find where the nut came from, especially with a guess of size.