Officially received my letter from RAV HQ yesterday confirming that they approved the buyback of my car. Took exactly a week from the phone-call to receiving the letter. I was honestly surprised. I'm sure that the process isn't over yet and the "fun" has yet to come, but I was expecting a fight on Ford's end prior to the approval (ie a phone call investigating the reason for it). Guess they realized that they messed up (as can surely be seen via my service records). Going to be weird not having a Mustang for the first time since my "driving life" began, but will be happy to no longer have the headache.