13. The Board shall register any employee as a member of the Fund when it receives the first contribution for the employee in the following manner:
(a)
in the case of a member who holds a Singapore identity card, the Board shall allot him a registration number which shall be the number of his identity card; and
(b)
in any other case, the Board shall issue a certificate of membership for the employee and send it to his employer who shall immediately give the certificate to that employee, or if the employee is no longer in his employment, return the certificate to the Board.