I don't really see it as snide. Snide would be telling you that you didn't pay for the game so you are clearly not entitled to the bundle per the rules and leaving it at that.
I think they asked the question because there might be the off chance that someone on the steam forums or elsewhere might have actually paypaled in exchange for the game not knowing it was free or the key was a free key and they might be asking to see if that was the case and would probably honor the deal if that was so.
That's true. I won't pursue it since it was a code from SteamGifts.
Also, I have a code for FlatOut that I don't need. Unnecessary story: Broke up with my two year g/f in January because she was cheating on me. I'm generally a really nice person, so we still talked after. I sent her the code for her birthday yesterday because I'm nice and I don't need it. I have no idea if she used it since she blocked me on Steam, changed her name and doesn't speak to me; shows you what kind of person she is. So first person that PMs me gets the code, however it may have been used.