CD key comes on the jewel case insert (inside I think so you don't have to worry about someone leeching it) and it's a shooter, you don't need a manual. Great price for this one, if you're doubting it at all,
All you need to know:
Use "use" key to enter a vehicle.
Switch between positions in a vehicle, including ship, with the number keys (not numpad).
To get to position on a ship, go to open doorways. If someone is occupuying that spot, you have to find another one.
Engineers can repair all vehicles, disarm landmines and tnt.
On how to do called Artillery strikes, just look for a faq or search bf1942 forums. Manual sucks explaining this anyway.
Now off you go...