– Original retail copies of CS 1.4 (which required Half-Life) are collector's items now.
If you want, I can draft a formatted article for publication (500–1,200 words) tailored to a general audience, retro-gaming collectors, or technical preservationists — specify the intended audience and desired length.
If you're unable to find your CD key or never had one in the first place, don't worry! You can purchase a new CD key from various online retailers, such as:
Released on April 24, 2002, Counter-Strike 1.4 arrived during a transitional period for Valve. At this time, players typically acquired the game through retail boxes published by Sierra Studios. These physical copies contained: