The board’s good faith determination of entitlement to payment pursuant to Section 21493, 21494, or 21506 shall be based upon such evidence as a death certificate, marriage certificate, or birth certificate for persons in a higher ranking group of statutory beneficiaries. However, where the evidence is not available, the board may accept a sworn statement by one claiming to be a beneficiary that there are no living individuals in any of the higher ranking groups of statutory beneficiaries, that the estate does not require probate, or that the relationship of the claimant to the decedent is as claimed.