I have a feeling that the crytek guy hasn't actually read my problem....If you read this please re-read my problem on p1(lost manual with serial).
Location of serial in registry please please!

Program Files/Electronic Arts/Crytek/Crysis 2/Bin32/Activation (it's an application, open it and it should say your serial at the top with other stuff).
My game is at Program Files/Electronic Arts/Crysis 2 Limited Edition but I think that's just because I got it with the EADM.
I didn't read your P1 post either, so I'm assuming your game is installed.