(1) Why were SA Revenue Service (Sars) customs officials not present at the Waterkloof Airbase on 30 April 2013 to ensure that correct customs procedures were followed by the Gupta family; (2) has the Sars Commissioner declared the Waterkloof Airbase a customs and excise airport in terms of section 6(1)(e) of the Customs and Excise Act, Act 91 of 1964; (3) (a) who will be conducting the investigation announced by the Sars spokesperson on 1 May 2013 and (b) when will the investigation be completed?