Traffic
My view is that "Looking for that Traffic G-CD" lets every body know - hopefully including the traffic involved - that you haven't yet seen him.
Just saying "copied traffic G-CD" just says you heard the message.
If I could see the traffic I would probably say something like "visual that trafiic one oclock and above G-CD" or similar (and often not with pedantic adherence to correct phraseolgy) to make it quite claer what I could se and if necessary what I was going to do.
DGG