Well, the contents of the case in Pulp Fiction are never explicitly revealed. It could be anything valuable or something symbolic that adds to the intrigue of the story.
The case in Pulp Fiction remains a mystery throughout the film. Maybe it contains some precious jewels, secret documents, or something even more unexpected. But we're never given a definite answer.
It's a mystery. We don't really know for sure what's inside the case. It's left to our imagination.