certified wood credit

That depends. Does the Div. 12 spec state that FSC materials be used? Is there a separate LEED Spec. If you don't have to, don't, because typical casework is mostly made up of recycled materials, and not much new wood, so the material used in the casework would most likely go towards the MRc4 for recycled content. However I have seen Spec that require FSC material even though the entire finished product is made wholly of recycled material, and can't contribute to the MRc7. You may need to contact the person who wrote the Spec and determine what credits they are trying to achieve and what other areas of the project may already cover the MRc7. Like flooring, wall panels even framing, any area that new wood would be used. good luck!

Please note that you can purchase a lot of recycled material products (MDF, particleboard) as FSC Mixed % and count them towards the MR 7 credit. They cannot count towards both MR4 and MR7 at the same time, however.