Mystery Crates

Diferen tiers of mystery crates that can be config in creative. 

Each box has its own key.

You can set the number of prizes and the items that can be the prize.

The prize will be one of the occupied slots and the cuantity will be a random number between 1 and the number of items in that slot. This means that if you put more than one item of the same type, it will have a greater probability of being the prize. The maximum amount is for each slot, so you must put the amount in each of them.

REWARD IMAGE:

Epic_box:

There's also a special crate that will drop any item of Epic rarity in Minecraft. Unlike the other crate options, the configuration interface locks items, but if you use a Basic_key while in Creative, you can open the reward item interface. If you have a lot of mods, it might fill up and not show all the items. However, if you remove the items and add your own, those will be the ones that visually dominate, although all will be potential rewards.

All boxes use the key if you are in survival, and all except the epic_box you can see the possible rewards by right-clicking on survival.