I've never seen these with storage in the lid before. I have an Electrolux z2020 which is the same design as this, but the came with the butterfly tool which hooks onto the handle and a crevice tool which doesn't store on-board.
From what I remember, the first Electrolux cylinder with the tool flap was the Dolphin in this country.
Perhaps this is a later model that was modified specifically to be sold as a Volta?