Obviously that trick isn't helpful if you don't have a digital paper trail of your Office purchase, but it's worth the trouble if you might.
N'ụzọ doro anya, aghụghọ a adịghị enye aka ma ọ bụrụ na ịnweghị akwụkwọ edemede dijitalụ nke ịzụta Office, ma ọ bara uru na nsogbu ahụ ma ọ bụrụ na ị nwere ike.