When a pile of money is dropped, it's on it's side instead of laying flat. Also the size of the bills in the open briefcase look really small.

It seems the items cannot be created directly in the backpack via addItem. I tried it with the laptops, money and the Mobile phone. canAddItemToBackpack for the items also return false.
Creating the items via createVehicle and then picking it up to the backpack via action however works fine.

The portable harddrive is not visible outside of inventory. It stil can be picked up from ground after it being put to ground from backpack/inventory.