Section 123.26 - Transshipment of merchandise moving through Canada or Mexico(a)General. Merchandise in transit proceeding under the provisions of this subpart may be transshipped from one conveyance to another in foreign territory. When transshipment requires the breaking of Customs seals, the breaking of the seals, transshipment and sealing of the conveyance or compartment to which the merchandise is transshipped shall be under the supervision of a Customs officer. He shall note his action on both the additional copy of the manifest presented to him, in accordance with § 123.25(b) , and on the original copy, which shall be returned to the person in charge of the conveyance to accompany the merchandise. Merchandise transshipped in foreign territory without customs supervision when Customs seals were broken shall be treated upon return to the United States as imported merchandise.(b)Storage awaiting transshipment. Merchandise moving under in-transit manifests and Customs seals which is to be stored in foreign territory awaiting transshipment shall be checked into a storehouse by the Customs officer at the place of transshipment. It shall remain under Customs locks and seals until transshipment is completed under Customs supervision.(c)Manifests where contents broken up. When transshipment involves the breaking up of the in-transit contents of a conveyance or compartment, in such a manner as to require separate manifests for articles previously covered by a single manifest, the Customs officer supervising the transshipment shall take up the carrier's copy of the manifest and require the carrier to prepare a new manifest, in duplicate, for each conveyance to which the merchandise is transshipped. If there is to be further transshipment, an additional copy of each new manifest shall be presented by the carrier, and shall be returned to the person in charge of the carrier for delivery to the Customs officer at the point of further transshipment in accordance with § 123.25(b) . After the transshipment and sealing of the conveyances and compartments has been supervised and the new manifests certified the originals of the new manifests shall be returned to the carrier to accompany the merchandise to the point of reentry into the United States.