For flood determinations, if an institution does not fall into one of the specific categories of FDIC-insured, farm credit,etc., the instructions indicate "other lenders who fund loans sold to or securitized by FNMA or FHLMC should enter FNMA or FHLMC seller/service number". Does this mean that if you ever sell to FNMA/FHLMC, then you enter that number on all determination you order or that if you are not selling to that specific loan to them, you leave it blank?