I can't find my activation thing

Can someone tell me what the activation key looks like when you buy Guild Wars prophecies "Best Game of the Year" edition
I can't find it and am currently playing on the 14 day free trial

I bought the game today

Have you got a black peice of card? There should be 3 perforated edges on it. Tear them off and open it up.

Some came with the black card that you tear open along the perforations.
Others may have the plastic credit card you scratch off with a coin, that my collectors editions came with.

Check everywhere including the disc itself its container the manual etc then call arenanet.