MPEP § 2920.03
37 CFR 1.1066(a) sets forth how the Office will establish the correspondence address for a nonprovisional international design application in the absence of a communication from the applicant changing the correspondence address. Specifically, 37 CFR 1.1066(a) provides that, unless the correspondence address is changed in accordance with 37 CFR 1.33(a) the Office will use as the correspondence address in a nonprovisional international design application the address according to the following order: (i) the correspondence address under 37 CFR 1.1042; (ii) the address of the applicant’s representative identified in the publication of the international registration; and (iii) the address of the applicant identified in the publication of the international registration.
See MPEP § 601.03(a) for further information regarding changing the correspondence address in an application.