Sam studied the outside of the box and the symbol etched onto the key, thinking. His fingers traced the lines, trying to remember if he'd seen it anywhere before.
"The symbol could be a sign," he said, holding out the box and key for Dean to see. "Do you recognize it?"
It had to be significant, though he wasn't sure how. And while Dean might not enjoy the research side of things, Sam knew damn well that he was smarter than he sometimes let on or believed himself.