Unclaimed contributions. Procedure for claiming.

(b) Any accumulated contributions or other benefits so deemed abandoned may be claimed by the person entitled to the accumulated contributions or other benefits, or in the event of his death, by his estate or by such person or persons as he shall have nominated to receive such accumulated contributions, by filing a claim with the retirement board in such form and in such manner as may be prescribed by the retirement board, seeking the return of such abandoned accumulated contributions or other benefits. In the event such claim is properly made the retirement board shall pay over to the person or persons or estate making such claim the amount of such accumulated contributions or other benefits.