The imager should come with another small booklet for operating the imager itself, and a manual for 3D Minestorm. Despite missing those two things, I've seen boxed hardware go up in value over the last 2-3 years, so that's probably a $500 item at minimum.
In terms of value, the standard games, if complete, are probably worth $15-20 each. Star Castle is about $50, Pole Position is $75 and Polar Rescue is around $150. I can see you probably have at least two of those three in shot. Higher prices because they were the last three releases and are harder to find. The lightpen programs are probably $30-40 each, and the other 3D titles about the same. The lightpen itself, if complete, is probably around $100.
I'd be interested in the pin btw if you chose to let it go. Always after new promo material for the Vectrex to add to my collection