The changes we're making to the Mythic+ system for Battle for Azeroth will prevent you from receiving your normal Mythic Cache this week. As this was unintentional, your cache will include 1000 Wakening Essence and a Keystone instead of your normal rewards.

https://us.battle.net/support/en/article/000057691


Location of M+ Weekly Chest!
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DK = Next to Mission Table.
DH = Near the Mission Table next to a side wall.
Druid = Near the NPCs standing in the middle who give artifact / class hall quests.
Hunter = Between Mimiron's hologram and ramp going up, near the Mission Table side.
Mage = When you port in, move to your right.
Monk = Outside the Inn left side facing the Inn.
Pally = Right side of the doorway towards Artifact Table area before you go inside.
Priest = Next to the Mission Table.
Rogue = Inside the room that you open by clicking on the Torch, with Class Hall traits NPC
Shaman = Next to the Mission Table, to the right side.
Warlock = In the middle left side, close to the Class Hall traits NPC.
Warrior = Go to Odyn's room, immediately turn right when enter.

Hopefully this will help those who have no idea where the chests are