German Grey

Attention to German Shepherd Bredders!!?

My female just had 8 beautiful puppies. She had 6 black and tan and 2 GRAY puppies. In all the years I have been had German Shepherds I have never seen a gray one. I checked on the AKC website and there is indeed a gray color for shepherds. My question though is if it is rare to have a gray German shepherd pup. I would appreciate someones help on this. Thanks
I tried looking it up on google and I couldnt find anything not that answers my question anyways.
It might be a blue.. I seen some pictures on google that looked sorta like the pups. So they might just be blue
Like i said ive never seen one before, I have only ever had black and tans, black and red, and sables.

http://www.justshepherds.com/colors.htm

http://ezinearticles.com/?Silver-German-Shepherds&id=409920

From that last link is this comment:

“Color genetic

Today, breeding between German Shepherds is maintained to protect the breed. There are now different lines such as the International Working Line, International Show Line, and the North American Show Line. However, “mutations” within the breed still do happen like in the case of German Shepherds with white or silver fur. Some purists do not consider these “mutations” acceptable and they argue that the white and silver-furred German Shepherds should not be considered pure. In most dog shows, white and silver-coated German Shepherds are disqualified because their fur is seen as a genetic “fault.” There are clubs who try to support these kinds of German Shepherds like the White and Silver German Shepherd Club. They lobby for the white and silver-coated dogs to be recognized as a standard. Color is widely genetic. White and silver fur usually comes from the line of tan and yellow. However, color genetic and pigmentation in dogs are not yet fully understood.”

DIR EN GREY on German TV