: Original physical keys can sometimes be used as "proof of ownership" to recover a lost Steam account through Steam Support. Warning on "Top" CD Key Lists
In the pre-Steam era, CD keys served as the primary proof of purchase. For Counter-Strike 1.4, which was often installed as a mod for cd key counter strike 14 top
In the context of Counter-Strike, "14" almost certainly refers to (an older historical version) or, more likely, is a typo for Counter-Strike 1.6 (the most popular version associated with cheap CD keys). It could also refer to CS:GO/CS2 keys sold for around $1.40 on third-party markets. : Original physical keys can sometimes be used