The sixteen locations are:
Military Base
Boneyard Dam Downtown Storage Town Hospital Aiport Quarry Port Stadium Gulag Lumberyard TV Station Superstore Hills Train
There is no specific crate in which you can find the rewards - it is completely random. However, we can assure you of one thing and that is the fact that you will definitely get the reward after opening 2-3 crates. Whenever you get a trick-or-treat crate, it will have a fire animation with some confetti coming out of it.
Sometimes, it might take you longer, depending on how many people are dropping in a certain area. For instance, it took us more than ten drops on Superstore to get the Superstore crate, because it is a hot landing spot.
After collecting all sixteen crates from these locations, you will receive a nice Halloween themed legendary weapon blueprint for the Grau. There is also a brand new tab on your Warzone main menu screen that helps you keep track of your trick-or-treat crates hunt.
Below, we have listed down all the rewards with visuals. We also have a video guide.
Video Guide
Verdansk Trick or Treat Scavenger Hunt Rewards List
Military Base
Boneyard
Dam
Downtown
Storage Town
Hospital
Aiport
Quarry
Port
Stadium
Gulag
Lumberyard
TV Station
Superstore
Hills
Train
Final Reward
As mentioned above, after collecting all sixteen crates, you will get a new legendary weapon blueprint called ‘Pumpkin Punisher.’