What do you mean "i" added to minicopter? You changed the code? It's already there, and it doesn't look quite like you pasted it in.
},
"Amount Of Fuel To Spawn": 0,
"Refund Fuel On Kill": true,
"Refund Fuel On Crash": true
},
You can't just add something to the config, that's not on the minicopter. Since the minicopter doesn't have storage by default, you must have a plugin that's placing storage on you mini copter.
If you have the plugin Vehicle Storage https://umod.org/plugins/vehicle-storage then by default, the items will drop. If you have only one item, it will be without a white storage wrap, but 2 or more, it will bundle them for you and is very easy to find.