The back of the box ties into a bow with a ribbon which is attached in the front of the box. This secures and holds the box lid/cover flaps down in place.
When you untie the box, the box flips over from the top by turning the lid/cover sideways:
Here's the box completely opened:
Depending on the size brads you use you may have to adjust the size of the hole. Initially I used a tiny brad which was fine for the small holes on the cut.file, but when I changed to a larger brad to accomodate the brad inserted into the flower I had to slightly enlarge the hole for it to turn properly. So, if you find your lid/cover is tight, just enlarge the hole until it's appropriate with your brad size to move freely.
Isn't it cute!