Those are not standard molding profiles, they may be from the same job but don't necessarily go together. They could be from different jobs, too. In architectural woodworking, millwork is detailed by an architect and can be a one of a kind design for a specific job application. The cove profiles could go with something like a flat board that is shiplapped to join with it as part of a paneling system but that's a guess. They could have been used on cabinetry, paneling or trim work. It's common to run extra on such jobs and this may just be leftovers. I would advertise it with a picture and let the buyer figure out a way to use it.