Batman was a hit on TV in 1966 so Burry's ran a great promotional offer for a mail away Aurora Batmobile kit. To promote it they made a giant vacuform plastic sign.
Also in 1966 Burry worked with the popular TV show, the Green Hornet, and issued a plastic bike badge. The bike badge shows up but the boxes with the offer are quite rare and did not just appear on cookie boxes but also on an ice cream sandwich box!
photo from Hake's
photos from ebay