I have the Amiga version (published by Firebird) and it sounds like yours is NOT complete.
You should have a disk (obviously
), an A4 sized Keyboard Controls card, a small Manual booklet and a book called The Dark Wheel, which was a "novella" to set the scene for the game. I think there is a poster showing the ships in service as well. If you look up Elite for the C64 at Gamebox 64 you will get an idea of what I mean and be able to download the novella and poster.
These all were in an A5 sized box, does this sould like what you have?