After the quite deluding Jurassic Park 3 models, in 2013 Hasbro relased a new Jurassic Park line, Dino Showdown. This line featured an elevate level of articulation and the return of the Kenner Dino Damage but, despite this, probably it was not so succesful, because just two models (Allosaurus and Pachyrhinosaurus) were released, while pictures or other two planned ones (Carnotaurus and Stegosaurus) were leaked.
Now, thetoyvault auctioned in his ebay store some prototypes: almost all of them feature a code on the head.
This is Pachyrhinosauru, sculpted by David Silva and based on the Hasbro designs:
Allosaurus:
A first version of the painting (or maybe a variant?) of Allosaurus, more grey than blue:
And, for the first time, the unreleased Stegosaurus:
The Stegosaurus reached $9,000.00 on the eBay auction!