On November 21, 2017, Bonhams auction house in New York City held an auction of movie memorabilia including many pieces from the estate of Harper Goff. Several pieces of concept artwork for Willy Wonka and the Chocolate Factory were up for sale. (Thanks to Justin Humphreys for letting us know!)
- Drawing of the main characters
- Design of the Chocolate Room
- Drawing of the Chocolate Room
- Candy tree
- Candy tree
- Candy trees
- Storyboard
- Storyboard
- Drawing of the tunnel
- Drawing of the Wonkamobile
- Drawing of the Wonkamobile
- Drawing of the Wonkamobile
- Wonkamobile
- Drawing of the Wonkamobile
- Drawing of the Wonkamobile
- Drawing of the Wonkamobile
- Drawing of the Wonkatania
- Drawing of the Wonkatania
- Drawing of the Great Gum Machine
- Drawing of the Great Gum Machine
- Drawing of the Great Gum Machine
- Drawing of the Inventing Room
- Drawing of the Inventing Room
- Drawing of the Inventing Room
- Drawing of the TV Chocolate Room
- Drawing of the Great Glass Elevator
- Drawing of the Great Glass Elevator
- Drawing of the Great Glass Elevator
- Drawing of the Chocolate Factory
- Drawing of the Chocolate Factory