All the safeguards provided by law for the protection of public moneys, and all statutes relating to the embezzlement, conversion, improper handling, retention, use, or disposal of postal and money-order funds, false returns of postal and money-order business, forgery, counterfeiting, alteration, improper use or handling of postal and money-order blanks, forms, vouchers, accounts, and records, and the dies, plates, and engravings therefor, with the punishments provided for such offenses are extended and made applicable to postal savings depository business and funds and related matters.