Well, I finaly found a copy of Doom: The Board Game expansion set and I received an extra red cacodemon piece and am missing a red vagary piece...I just emailed FFG but I'm sure I wont receive a response til tomorrow, but if I cant get one from FFG, anyone willing to trade a red cacodemon for a red vagary?
And no I dont want to return it, god knows how expensive this expansion will be later and I dont want to risk not finding another one anymore.
You should be able to get a replacement from FFG. Normally they're very good about that sort of thing. The only detail which might foul such a request is if FFG themselves are out of the spare bits you need.
Even then, it's easy enough to go about playing with the green or blue Vagary instead. Just explain to your group how your copy is missing the red Vagary and you're using the other as a substitute. The only problem you'd run into then would be if you were playing with 3 marines and needed all three Vagaries at once. Even so, I imagine you'd have other like-sized figures to use as a substitute red Vagary.
Here's hoping FFG still has the bits to help you out. =)