Krusteaz Cookie Mix Holiday Cookie Mix Over Expiration...still Good?

Holiday cookie mix over expiration...still good? - krusteaz cookie mix

I came to a mixture of sugar cookie holiday Krusteaz in a big box of 5 packets. Noted the "Best Before" date of October 2007 that more than 2 years! Therefore, it is almost mid-June 2009 I was asked if the mixture is always a good thing, or even "safely" eat too. The box and unopened packages have been kept since his assembly line. What do you say?