How much would you say one is worth that is missing the receiver and joystick attachment. I have one that is missing these parts so I was really just wondering if the box and instructions are worth anything themselves since the controller is basically useless.

It's a fairly rare joystick, but as with most of these controllers, the price generally stays around $15-30 CIB. With the parts missing, I'd say around $5-20 depending on interest.

I would be very interested in just the box.