This is a remix of bodos stackable insert boxes.
These boxes are for the corners of a L-Boxx 102 (Affiliate link) so you can utilize the extra space, which isn't a enough for a full size box.

Pay attention to which corner you want to print, you maybe need to mirror the box in the slicer.

Or just use my print profile, where you can select the appropriate variant by the build plate.

There are two generations of the L-Boxx. The older one (pre 2017), which you can't open with a box on top and the newer one (past 2017), which you can open with a box attached to the top. This model does only fit the newer generation.