(a) The depository shall recognize the authority of an attorney-in-fact authorized in writing by a depository account holder to manage or withdraw precious metals from the depository account holder's depository account until the depository receives written or actual notice of the revocation of that authority.
(b) For purposes of this section, written notice of the death or adjudication of incompetency of a depository account holder is considered to be written notice of revocation of the authority of the account holder's attorney-in-fact.