Just so you all know - Fedex drivers can opt NOT to deliver a package for any reason if they personally deem it "unsuitable for delivery." Neither the sender or intended recipient will be notified of this decision. It doesn't matter how clear you make it to Fedex that the package must arrive and that no signature is necessary or specifically to leave the package at the door - the driver can just say "nope!" and guess what, you have no recourse.
Fedex won't even explain why it was "unsuitable for delivery" and they will not refund your money. Caveat Emptor!