(1) The commissioner may give a signed certificate—
(a) stating that on a stated date or during a stated period a named person was or was not registered; and
(b) if the person was registered—including details of the person's registration.
(2) A certificate under this section is evidence of the matters stated in it.
(3) Unless the contrary is proved, a document that purports to be a certificate under this section is taken to be a certificate.