大使館などに送ったり持って行ったもダメだということも分かりました。↓
『Do not mail your Form I-94 Departure Record or supporting information to any U.S. Consulate or Embassy, to any other CBP office in the United States, or to any address other than the one above. Only at this location are we able to make the necessary corrections to CBP records to prevent inconvenience to you in the future. 』