So, Skyrim just disappeared from my library, wtf valve?

Yesterday, i was thinking about playing Skyrim again. I had bought it many months (maybe 2 years ago -not 100% sure but it was in 2013) from a trader. It WAS a cdkey, i paid him via paypal. I'm pretty sure he was a trustworthy trader cause im a really experienced trader and i wouldnt trade a cdkey if his rep wasnt really good since i know the risk of being scammed and i guess i know almost every way i could get scammed. Anyway, im going to download my game and i cant find it in my library. I had played about 45 hours in the past. Here i have to mention a weird thing; from the first day i bought/activated it and played it the game didnt show up in my games list, where you see how many hours of each game you have played. Another weird thing is; i bought 2 keys from the same trader, the other key was activated from a friend and he still owns skyrim. There's no sign in my account that i ever had skyrim, the only one is this . It's on my account details. Nothing else. Probably, it was a cdkey bought with a stolen card but here come some other questions like: if it was like this, wasnt i supposed to be informed that my game was revoked? i got no mail/notification or anything related, it just gone poof! and disappeared. And after so many months? wtf i had played it a few times already.. I feel like they broke into my house and stole my skyrim copy.

tl;dr -> skyrim missing from my library; bought it as a cdkey about 2 years ago; nobody informed me or anything; wtf valve?

edit#1: when i go here: http://steamcommunity.com/id/etze/stats/TheElderScrollsVSkyrim/?tab=achievements i get this

edit#2: Here's some more info. i HAVE a skyrim badge dated December 2013 + 45 hours on record. Here you go