in today episode of "what is that smell"

I worked selling cars at a Nissan dealership. The was a really nice 4wd ford
Quad cab that I saw other salesmen trying to sell. No joy. I asked one day why it didnt sell, tbe sale manager gave me the keys and said chek it out. A soon as I opened the door, The smell told me that someone had died and rotted in there.They eventually wholesaled it.