I'd suggest selling the individual spares first: especially if they are new in the package still. That way those will bring in a lot more cash. Once you get a view on what's not going to sell easily you can include it still with the car.
If it's got an ESC and servo: include them with the car. The radio and receiver: toss them out: nobody wants those and they only drive up shipping cost... unless it's really a collectors piece.
Should you have slipper parts I demand first choice in exchange for the above advise