The previous occupant left a trove of items in the home.

TL;DR: New owner found the previous owner’s stash and wants to convert the room back into a movie/theater room.

TBH, If I were the new owner, I would just keep whatever supplies are still good, probably reorder the room a bit, and use extra space for other things as intended by the new owner. Disposing of the entire prepper stash would be a waste, IMHO.