Unknown key

 (Unk. key) is an item in Escape from Tarkov.

Description
The key was found on the body but it is yet unknown what it opens.

Key Location

 * Found on a body hidden in bushes on Customs behind the Welcome To Tarkov truck.
 * Pockets and bags of Scavs

Lock Location
In the crane yard on the east side of Customs. 

Behind the Lock
Nothing unless the Quest The Extortionist is active.