I google images to find one that looks like yours Andy. The first two I saw each say one box graham crackers.
Mr Food says :
One box of graham crackers contains 3 individually wrapped packages of crackers. Use one package for each layer of this decadent dessert.
Read more at Chocolate Eclair Cake | mrfood.com
When I use instant pudding, I add a tsp of vanilla and w/ chocolate pudding an extra spoon of cocoa powder and mix in. I too am not sure what food group Cool Whip belongs in, so I use real whipped cream.
I copied this because it is an easy no bake dessert for hot days.