Not all FSC certifications are equal for credit compliance! Pay attention to the different types of FSC certification, which you can find on product cut-sheets: 

FSC Pure: valued at 100% of product cost.  This is when the product is 100% virgin FSC material
FSC Mixed (XX%): valued at XX% of product cost.  This means that the product contains a certain percentage of virgin FSC wood and a percentage of other materials.