Why do you think the sire is wrong? Did you maybe think the sire was a different one for some reason?? Can you explain a little further?
There are a few different senerios that I can think of why this would happen....
How many litters does this breeder have right now? Breeders has more than one litter and handed you the wrong paperwork. If this is the case, its not only the sire that would be wrong, but also possibly the dam. (dam would be right if the breeder bred the sire to different females). This would be one way for a breeder to give out the wrong papers, but any responsible breeder I know of would have already had all the paperwork lined up and ready to go with each puppy. (generally in some type of envelope, folder, etc with the puppy information on the outside so they know they are giving the right one for that particular puppy).
Breeder just outright lied to you about who the sire was OR you mis-understood who the sire was.
Breeder could be using faslified documents.
The breeder is the only one who can correct with AKC.
I would recommend contacting AKC's Compliance & Inspections Department along with the Registration Dept.
Sabrina Jay JeSaJay's Boxers
MidWest Boxer Rescue/Mo-Kan Boxer Rescue http://www.midwestboxerrescues.com