100% wrong...and if it's no 'big deal', why did you have the Mustang certified by Ford?Not a big deal the cars still have warranties...
I just bought a mustang at a Cadillac dealer and they sent it to their ford dealer to be certified.
FYI...although, anythings possible, in most cases, if the Mustang was not sold thru the Ford dealer (with a bill of sale from the Ford store), it does not have the Ford Certified warranty.