감사합니다! 

기억을 되돌려보고자 한번 찾아봤습니다. 저도 아멕스 플랫으로 샀기도 했구요.

https://web.aexp-static.com/us/content/pdf/card-benefits/PlatinumCardfromAmericanExpress/EW-DOC-CCSG.pdf

PURCHASES NOT COVERED The following are not covered: 1. products covered by an unconditional satisfaction guarantee; 2. motorized vehicles (including, but not limited to, passenger cars, trucks, motorcycles, boats, airplanes) and their parts, subject to high risk, combustible, wear and tear or mileage stipulations (including, but not limited to, batteries, carburetors, pipes, hoses, pistons, brakes, tires, or mufflers); 3. motorized devices and their parts used for agriculture, landscaping, demolition or construction; 4. motorized devices and their parts which are permanent additions or fixtures to a residential or commercial building; 5. business fixtures, including, but not limited to, air conditioners, refrigerators, heaters; 6. land or buildings; 7. consumable or perishable items; 8. animals or living plants; 9. more than one article in a pair or set. Coverage will be limited to no more than the value of any particular part or parts, unless the articles are unusable individually and cannot be replaced individually, regardless of any special value they may have had as part of a set or collection; 10. items still under installment billing; 11. additional service contract or extended warranty coverage for a computer, computer component or part that You buy which already comes with an original United States of America manufacturer’s warranty, unless such coverage is provided and administered by the original manufacturer; and 12. items purchased for resale, professional, or commercial use.

결론: 아멕스는 리퍼라고 차별을 두지 않습니다. 체이스는 used 제외라고 명시되어있던걸로 기억합니다.

수정: 체이스도 "미사용 리퍼비시"는 워런티 연장을 해준다네요.