It might, might not. Would be a shame if it were though. I would understand if I were doing it just to break the rules, but I'm hoping they see that there are certain circumstances, such as mine, which are exception to the rule(s).
1) SteamGifts itself allowed me to enter while I was not in possession of the base game.
2) I was under the assumption it would be a full package and not just DLC.
3) Nice people are nice.
I'm not doing this to spite anyone or to overstep the rules, I'm merely giving somebody the chance to recieve what was theirs if I hadn't been able to enter, that's all because honestly if I'm not allowed to give back what isn't mine then SteamGifts practically allowed an unethical act to happen, and by doing that then they have no power whatsoever to deny more of these acts from happening, thus negating the point of the site altogether.