TM2 Disappeared in Steam?

I just logged into my Steam account and went Library then Games and my TF2 install isnt there. I downloaded it on Friday. It doesnt show anything with TF2. And when i go to my Steam Content folder manually all the files are still in there involving TF2 it looks like. Anyone have an idea why? HaHa so weird. I never remember buying TF2. But it was in my game section when released. Im thinking maybe I did a really long time ago or I got it with a pack of games i bought i while ago lol.

Never mind i got it working. I went to steams website and sure enough i didnt own the license for TF2. So i bought it for the awesome price of 9.99 and it showed up. It just threw me off that i was able to download it and play it friday. I never read anywhere about a free demo or something. Weird. Whatever HaHa.