can the retail copies of dishonoured and hitman absolution be redeemed on steam?

Hitman - yes I;m not sure about Dishonored

I can confirm that Dishonored retail is redeemable on steam. Just did it last week.

Dishonored definitely can. I don't really know about hitman but I think it's also that way as the previous one was Steamworks too.

Hitman and Dishonored are Steamworks titles. Hence, they should be redeemed on Steam.