I would bet two-month old crushed grain in a paper sack would be a bit stale, but still usable.
Next time, throw the grain in a ziplock bag and purge out the oxygen or a tupperware container. Oxygen, bugs, and moisture are really the only things that will deteriorate grain. Take away those factors, and it will stay pretty indefinitely.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!