A non local customer of the bank mailed a written letter (which she signed) requesting that we close her CD, the original CD was include with the written letter, but the customer failed to endorse it. Will it suffice if we attach the signed letter to the CD to close it or should we mail it back requesting an endorsement on the actual CD? We did verify that the signature on the letter matches the customer's signature we have on file. Just not sure how we should handle this.