This isn't related to the VehiCross but worthy of mention anyway.

My Wife's Eclipse came with 2 keys (one black and one grey). I always assumed they were the same until one day I locked the black one in the trunk (don't ask). I went to her work and got her key (the grey one).

The grey key would not open the trunk nor would it unlock the trunk release.

IT'S A VALET KEY!!!

Now I know.