Simple Python utility to create a simulated bin inventory and random json order, that you can get by running:

python random_orders.py order.json

Note that you can repeat experiments setting the used seed, and modify the likelyhood of the number of objects per bin too:

usage: random_orders.py [-h] [--probabilites PROBABILITES] [--seed SEED]
                        filename

positional arguments:
  filename              filename to save the json order to

optional arguments:
  -h, --help            show this help message and exit
  --probabilites PROBABILITES, -p PROBABILITES
                        Quote delimited list of probabilites. Eg "[0.5, 0.2,
                        0.2, 0.1]". Determines the likelyhood of filling up
                        with [1, 2...] elements the bins that aren't
                        determined by the contest rules. Defaults to [0.7,
                        0.2, 0.1], so that there are no bins with more than 3
                        elements.
  --seed SEED, -s SEED