Package stolen!!!!????

I just ordered a few hundred dollars worth of clothing and have been tracking it with the tracking number provided by fedex. I went to track the package today and it said it had been delivered and left on the doorstep. I left work to go get it and nothing was there. It did not require a signature so he should have left it reguardless. Is there any reason that the website says shipped and he may not have made it out there yet? is that a possibility? if not then i know someone took it off my pourch. in that case what happens? again it was about 300 dollars worth of clothing.