Mr. Skeen collects pc games by these old companies. I don't know much about them but here's the few I do remember he wants:
Space Quest (original black box version)
MERCHANDISE for like any series
Leisure Suit Larry (not #1, but I think he needs the rest? And not the new ones for the PS2 & such, that's not even the same Larry or something)
The Incredible Machine
Willy Beamish (he especially wants a mail-order watch you could send away for so if you have that I think he'd probably make me have a baby so he could offer you our firstborn for it)
I know he wants them to have the boxes and as many original inserts as he can get. If you have anything not on the list I can ask him about it.