Percepts.

When you purchased the Odyssey in 1972 you could get a free game from Magnavox if you register
the purchase and mailed the "free bonus game" coupon to them.
The only known game thet Magnavox gave away is Percepts , and because there was not to many of the Odyssey
owners who mailed the coupon to Magnavox this game is a much rarer game then the original 12. 

Overlays 2 
Green Percepts cards 15 
Purple Percepts cards 15 
Instructions 1 
Works with Cartridge #2

This is the Shipping container game box for Percepts is´s a very rare item because most of the owners added the game to the big Odyssey game box and thro this shipping box away.