It's a simple clip together Pull latch.
Mine are printed in Red ABS and can hold a pretty sizeable force. They aren't as delicate as the video makes it out to be, the box is actually pretty difficult to hold closed while attaching the clip with one hand…
Printing orientation isn't the same as the STL file makes it out to be! I have the orientation i printed them in as a picture.
The holes are for screws to screw into the wood but counter sunk bolts should also work great.
The author marked this model as their own original creation.