(1) a written request for disclosure in physical or electronic form;
(2) an original or copy of the power of attorney expressly granting the agent authority over the content of electronic communications of the principal;
(3) a certification by the agent, under penalty of perjury, that the power of attorney is in effect; and
(4) if requested by the custodian: (a) a number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the principal's account; or (b) evidence linking the account to the principal.
(a) a number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the principal's account; or
(b) evidence linking the account to the principal.