Section 67(5) in The Central Goods and Services Tax Act, 2017
(5)The person from whose custody any documents are seized under sub-section (2) shall be entitled to make copies thereof or take extracts therefrom in the presence of an authorised officer at such place and time as such officer may indicate in this behalf except where making such copies or taking such extracts may, in the opinion of the proper officer, prejudicially affect the investigation.