The Borden contract was very short term and concentrated advertising in the more populous Eastern markets.I found a link to a short blurb from the July 17, 1964 Time Magazine announcing that the contract was signed when the quints were 10 months old.  The location of article is
http://www.time.com/magazine/article/0,9171,875962,00.html

Here is the blurb:

Mary Ann, 10 mos., Mary Magdalene, 10 mos.  Mary Catherine, 10 mos., Mary Margaret, 10 mos., James Andrew Fischer, 10 mos., and their five older siblings take the giant economy-size carton.  What's more, says Mother Mary Ann, they have a new brother and/or sister due in September.  One company that that's strictly milk and honey to is Borden's, which has just lined up the quints and their family to boost everything it sells from gum to beans but mainly, guess what. Elsie, move over.
Advertising for Borden's
This ad appeared in the January 1966 Ladies Home Journal.  Incidentally, the quints were on the cover of this magazine.
On the left is the cover of a small booklet of recipes pulished by Borden.  Bottom photograph is first page inside the booklet.
The booklet is eight pages, but only the ones shown had pictures of the quints.