DHS is requesting the data pursuant to 19 US § 1509 - Examination of books and witnesses; In any investigation or inquiry conducted for the purpose of ascert

DHS is requesting the data pursuant to 19 US § 1509 - Examination of books and witnesses; In any investigation or inquiry conducted for the purpose of ascertaining the correctness of any entry, for determining the liability of any person for duty, fees and taxes due or duties, fees and taxes which may be due the United States, for determining liability for fines and penalties, or for insuring compliance with the laws of the United States administered by the United States Customs Service... So it's that last part, for insuring compliance with the laws of the United States administered by the United States Customs Service which probably comes into play in making the request to unmask the account, specifically because the account claims to be an employee of USCIS.