Is there a retail to steam transfer?

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Is there a retail to steam transfer?

Saw witcher on sale, looked at my shelf. Realized the only Witcher box I have is W2 some special edition type deal(collectors probably, map, 2 dvds, coin, pamphlet, envelope,that special vendor that was special for like one patch(thank god)). Got salty about people never returning my boxes back. Bought the other 2 versions because of some special reasons I can't think of right now. Then came here to ask inane question. I realize you can add any game on your drive to steams library, but some of the functionality of steam doesn't really apply to that scenario. So was there a way to say transfer Witcher 2 to steam?
 
You can only add it as a non-Steam game, to get an actual Steam key, you would need to buy the game again there (it is often on sale for $3).
 
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