Attempted to locate the participant using a commercial locator service. (iv) Cessation of status An individual shall cease to be treated as a lost or missing participant during any period the plan administrator has actual knowledge of the individual’s whereabouts and how to contact the individual, except that the requirements of this paragraph and any other requirement of this title which cannot be satisfied if the plan is unable to locate a participant shall be waived for the 180-day period beginning on the date the plan administrator first had such actual knowledge. (v) Joint regulatory authority Any temporary, proposed, or final regulation or other guidance of general applicability under this subparagraph shall be issued jointly by the Internal Revenue Service, Department of the Treasury, the Employee Benefits Security Administration, Department of Labor, and the Pension Benefit Guaranty Corporation. . (2) Amendment of Employee Retirement Income Security Act of 1974 (A) In general Section 404 of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1104 ) is amended by adding at the end the following new subsection: (e) Coordination with Retirement Savings Lost and Found (1) In general With respect to any lost or missing participant of a plan, a fiduciary of the plan shall not be treated as failing to satisfy any requirement to search for or attempt to locate, or to provide any document or information to, such individual, or any other requirement of this title which cannot be satisfied due to the plan's inability to locate the participant. (2) Lost or missing participant For purposes of paragraph (1), the term lost or missing participant means any participant or former participant, or the beneficiary of any such individual, with respect to whom the plan administrator or other responsible party (including a plan service provider or trustee or issuer of an individual retirement plan receiving a transfer described in section 401(a)(31)(B)) has— (A) satisfied the requirements of section 6057(a) of the