I can vouch for the quality of the black boxes. I have the tower of 3 in the workshop and during the week dad was backing into it with the artic and trailer, thought he had it moved far enough away but hit it and knocked all over sending stuff flying. In fairness to the box there's not even a dent in the box. I only know he happened because I questioned where all the sockets had gone and why all was messed up.
You can use them to play a fishing game where you fish for sockets, taps, dies ect from behind the drawers with a magnet:tdown: