In addition to the regulations applicable to all mail importations (see part 145 of this chapter), the regulations in this subpart shall apply to mail importations of absolute quota merchandise.

Any packages containing merchandise subject to an absolute quota which is filled shall be returned to the postmaster for return to the sender immediately as undeliverable mail. The addressee will be notified on Customs Form 3509 or in any other appropriate manner that entry has been denied because the quota is filled.

(a) Notification of quota restrictions. If because of quota restrictions, a mail importation cannot be released, the director of the port of destination shall notify the addressee on Customs Form 3509 of the procedure required by paragraph (b) of this section, and shall inform the addressee that upon return of the Acknowledgement of Delivery by Postal Service, the packages admissible under the absolute quota will be forwarded to him and the restricted packages will be returned to the sender as inadmissible. The port director may at his discretion hold packages if it appears that the absolute quota will reopen in less than 30 days.

(b) Acknowledgement of delivery. An Acknowledgement of Delivery by Postal Service shall be sent to the addressee. He shall be advised that if he desires to secure release of less than the total number of packages of the merchandise, the Acknowledgement of Delivery by Postal Service must be signed by him and returned to the port director. Such Acknowledgment of Delivery by Postal Service shall be in the following form:

(c) Agreement to less than full delivery. If, in any case, the sender of a mail package has indicated his agreement to the delivery of less than the entire importation at one time, an Acknowledgment of Delivery by Postal Service need not be secured from the addressee.

(d) Deposit required. If a portion of a mail shipment may be released, the port director may require a deposit of an amount sufficient to defray the expenses of repacking merchandise for shipment by mail to the addressee. The shipment shall be under Government frank without new postage.

Unless a formal entry or entry by appraisement is required, a mail entry on Customs Form 3419 shall be issued and forwarded with the package to the postmaster for delivery to the addressee and collection of any duties in the same manner as for any other mail package subject to Customs treatment.

If within a reasonable time, but not to exceed 30 days, the addressee fails to indicate to the port director an intention to receive delivery of the packages or a portion thereof in accordance with the notice on Customs Form 3509 which was sent to him by the port director, the importation shall be treated in the same manner as other undeliverable mail.