Find the CD case/ cdkey. I had the misfortune of misplacing mine 🙁 🙁:brokenheart::| :,(
I still have my original cd's though. I lost my starcraft cd key as well.
As such I can never play it again, and consequently I stick with warcraft III and avp2.
I hope someday that I will find my keys, and then I will finally be able to play starcraft online.
Edit: Hey spider, not everybody keeps cd's in jewel cases, some people prefer the more portable cd wallets that can hold hundreds of discs. I left my cd cases at my parents house when I went back to college after a summer, and then when they prepared their house for sale my cd cases vanished.