How collectable are C-64 Infocom games? The local SA by me has five Infocom games complete in the box (looks like they have all the stuff as well), but I'm not sure if they're worth picking up. Strangely two of them were in the standard Infocom boxes (Cutthroats and Ballyhoo), but three others were in gray C-64 boxes (Suspended, Deadline, and one other). Which box style is rarer?

Tempest