Okay so wasnt' in the couch, in his couch, in the toy box under the fridge or in the draw. So I finally stood up and it was sitting on the bench. Near the edge, I think he might have put it there!
Please his cotton socks, he has been doing this sort of thing recently. If there is a glass with fluid in it he is persistent for us to drink it, wants draws closed, cupboards shut, DVD's etc in a place (to play) not in the case. The list goes on, so I could just see his thought process in putting the card on the bench because I put most random things around the house on the bench!
So finally its found and I can not watch commercial TV anymore tonight!
Thanks for your help ladies, wasn't that fun! Oh and I did find a measuring tape on my hunt too!