There is a post on FB about this car. The owner claims its the real deal and the exact wording on the post is:
I'm very pleased with the way this article turned out. The executor of Grumpy's estate approved it before publication, he was given the rough draft , made a few changes and then gave it his blessing. The estate is behind the car and this article 100% so any negative comments from the "peanut gallery". I.e. Arch (Doug) Adam Ed Jerry Joe Richie aka the minions , will be forwarded to and addressed by the estate
The article in question:
http://www.onallcylinders.com/2016/10/07...-toy-iv-camaro/
Looking at all the pictures I do not see any butternut yellow anywhere on this car and toy 4 was originally butternut yellow. After Brooklyn Heavy owned the car the butternut yellow was still visible inside the trunk lid. There is too many inconstancies between this article and what was wrote about it and approved by the grump himself in the grumpys toys book.