Title & format required (DVD, Blu-ray, Combo pack etc.) Bidders need to know whether or not they can redeem them since DMR members are allowed to redeem only one code per title, per format.
Then I suggest you list as a mystery or random code so that your listing doesn't get repeatedly flagged for "not enough information". It also lets potential bidders know that they are taking a chance and may not be able to redeem the code.