"Completely Overkill Pack
This was a time-exclusive DLC that was only available for purchase during Hype Train in 2015 for $20, and was limited to a quantity of 50,000 copies.
--Extremely difficult to obtain, only acquired via trading with those who have extra copies; trades go for hundreds of dollars (USD); no Steam keys exist for COP, only tradeable inventory copies.
Contents: 14 MEGA masks, a Completely Overkill Safe and accompanying Drill to open it (Safe contained one random COP weapon skin)."