Hole in Rear Floorboard Hump 92 Rodeo
 

While replacing muffler and tailpipe in a newly acquired 92 Rodeo, I noticed daylight coming through rear floorboard. I then realized 1' x 2' hole in floorboard hump, above driveshaft(carpet pad exposed). It doesn't appear to be caused by rust and edges are fairly smooth. Can't locate old owner to ask about it. Am I missing a plate of some sort? Trying to load photo. Does anyone here have a photo of this area (underside, or better, of rear hump, interior body under carpet?