I have that same type box with the form to join the NWTF inside the lid too. However the load is Double X Magnum, 12 gauge, 3 inch, 2oz, #5 shot.
The price is still on the box and I bought them for $7.75.
Sorry I can't help you on when it was made though...I can't remember when I bought them either. Probably sometime in the mid to late 90's?