In the date of 27th march i made an trade with sameone on steam i gived him 8k CE for some cs:go items and we didnt have mobile authentificator so we decide to wait 15 days, after 15 days i got cs:go items and the trade it was still there and he didnt get ce (its says 5 min less). I write to steam support and the trade was declined he got his cs:go items back and i dint get my ce back. The steam was bugged and no one help me to get my Ce back!
Some photo maybe its help:
http://imgur.com/a/IU2iN
My steam profile
http://steamcommunity.com/id/socrstar
ING: Socrstar
SK related steam trade is not really safe.
Write a support request in SK, thats the best i can suggest.
But i think you should prepare for the worst.
Sorry :(