Dry Box Lock Clip.

[The Hat]

Here is a handy clip to use, it can be altered easily to suite any need, whatever size box you have you can customise it to any size and shape.
It comes as a SCAD and STL file, so it can be easily reshaped...

It came from thingiverse.com/thing:2362849 and was made by blackboots...

Here are the easy instructions for altering the size and shape...

 

[Nifty]

Wow, cool! Here's the working link: https://www.thingiverse.com/thing:2362849