To find the CDC Disposal Key needed to open the Suspicious Container in Dead Island 2, travel to the beach at Venice Beach. We came here during the Red Tide side quest.
Once there, you’ll find CDC Viscera Cleaner.
Take him out then retrieve the CDC Disposal Key from where he falls. Now that you have the key, travel to the spot at the CDC as shown in the map below.
You’ll now be able to open the Suspicious Container which will pop out a Liquidator Auto Carbine!