may be retained by an immigration officer or the Secretary of State, for so long as the officer or Secretary of State considers its retention necessary for a purpose relating to a relevant function;

must, subject to any provision made under sub-paragraph (2), be returned when it ceases to be retained under this paragraph.

provision applying (with or without modifications) section 49 of the Immigration Act 2016 (duty to pass on certain seized items), or

provision corresponding, or similar, to the provision made by that section.