Additional information and the attendance of the person who gave the notice may be required

If the notice given under section 428 and the documents, if any, furnished under section 429 do not supply all the information which the Commissioner deems necessary to enable him to deal satisfactorily with the case, the Commissioner may, at any time within thirty days after receipt of the said documents, by written notice, require the production of such further particulars and details as he deems necessary.