I can't weigh in on the year, but would probably start by looking at the included players and when they started/stopped playing.
I have owned (1) and seen other boxes (I want to say 2-3 in addition to yours) as well as a wrapper and unopened pack. A quick google search turned this up:
http://www.thetoppsarchives.com/2009...ak-attack.html
If I am not mistaken a couple of board members may own and have better images of the same if they see the thread and choose to post.
While I haven't really actively collected boxes/packs or wrappers - I am always on the lookout for test issue related items. There was an incredible collection auctioned a while ago that included many test boxes and wrappers including 1968 Topps 3D, 1966 Topps Punchouts (Yes 1966) and 1967 Topps Giant Stand ups among others - now that Stand up wrapper and box was the only I ever seen.