When exercising its Article 80(1)(c) power, the DFSA may retain possession of any document for so long as is necessary for the investigation to which the notice relates. When a Person is unable to produce documents in compliance with a requirement made by the DFSA, the DFSA may require the Person to state, to the best of that Person's knowledge or belief, where the documents may be found and who last had possession, custody or control of those documents.