Thread:Emptylord/@comment-26859534-20160324050542

I'd suggest reading https://support.riotgames.com/hc/en-us/articles/207884233-Hextech-Crafting-Guide if you are not familiar with how the Hextech Crafting system works.

Hextech Chest (and Promotion Chest for Purple ones) is the official name.

Your other edits show a misunderstanding of how the system works.

tl;dr: You start with 4 chests drops, you get one every 7 days if you have <4 drops left. You can stockpile them as long as you want without wasting drop chances. Keys are required to open them and the content of chests is completely random (doesn't matter how you obtained the chest) and can be stuff you already have. 