FedEx problem BIG one

I just bought a laptop online to replace the one I had, and it was delivered this morning. Or so I thought. The FedEx guy put the box on my desk up front like he always does, and came back to my office so I could sign for it. I was on the phone so I signed it, and off he went. I got to a point where I could pick it up, and the box was EMPTY. Nothing in it at all except the cardboard and styrofoam packing material. Am I now screwed because I signed for it without inspecting it?