The FBI Man is a corpse that the Fratellis are attempting to hide. The Goonies first spot him, but don't necessarily realize it's a body, when Jake is seen carrying it into the basement of the Lighthouse Lounge. After the Fratellis drive away from the restaurant the Goonies get their first up-close look at him when he falls out of the basement freezer that Chunk opens. They see that a bullet hole in his head.