Note: This wil only work in the versions of 1.11
What are Random Crates?
They are chest when you place it there wil be displayed a animation and you wil get a random item.
How to get the Random Crates?
you can get them with the command /RancomCrates or when you have joined the server for the first time (if it's set to true in the config file).
Particles and Animations?
When you place a Random Chest there wil be a animation
Check this video to see it: https://youtu.be/hijQ0e9BINY