To promote their debut Rainbow Nights album, Toadstool Shadow buried a treasure chest in the small town of Yellow Springs, Ohio. The treasure chest contained antique silver coins, rubies, emeralds, jewelry, a Cadillac hood ornament, and more. Everybody who bought the album got the first of 12 clues to the buried treasure. On the full moon of August 1, 2020, a pair of treasure hunters from Springfield, Ohio finally located the treasure chest. It was buried on the only island in Yellow Springs: the small street island in the middle of Center College Street.