https://faq.ssa.gov/en-us/Topic/article/KA-01711
"Tell us if your address changes so the checks and mail we send you will not be lost or delayed. Even if we(SSA) are sending your payments to a bank or other financial institution, report any change in your home address"
https://www.ssa.gov/pubs/EN-05-10137.pdf
"We send questionnaires to persons receiving social security benefits (or their representative payees) outside the United States every year . . . "
거주지 등등 변경 상황에 관하여 보고의 의무 사항이 있네요.