olx -> aliens?

I posted an ad on olx.com to sell my old books some months back. I got a response yesterday. Someone interested in buying it. But now I can't find the book even after I've been searching all morning. Come to think of it, just a crazy thought appeared. May be once you post something on olx.com, it just disappears and gets transported to their silos. May be olx.com was started by aliens.