Updated to remove the ribbons. Added tabs to assist in locating where the locks are.
Use the latch and bows from the original or make your own like I did from the boxer head.
Boxer is a remix of Boxer Head trailer hitch cover by c3poSAW | Download free STL model | Printables.com
Modified to mount where the ribbons mounted.
The author remixed this model.
Filled in the ribbons. Added a nibs to use for alignment.
With the boxer hitch cover - resized and filled in the hitch ball area to match the top of the box