GameRager: If it was a multi game key the other person redeeming games from it might've accidentally redeemed more than they should've...or OP messed up(it happens to all of us). Either way I hope OP looks into this. :)
finkleroy: There's nothing that can be looked into. It's impossible to see how many items a key contains before or after it's been redeemed, and after it's been redeemed, there's no way to see who redeemed it.
Oh, I was under the impression you were told by donor what games ere on what keys. If I was wrong then my mistake. :)