Leave a note on your door (just to be on the safe side) that says something like:

FEDEX DO NOT LEAVE MY PACKAGE AT THE DOOR, PLEASE KNOCK OR RING THE BELL REPEATEDLY, THANK YOU

It doesn't happen often but it's happened enough times that I never trust a delivery guy to not dump a package at my door.

Next time you order a snake online, insist that the shipper/seller email you the tracking number so you can track the package yourself through the FedEx site. I know that a lot of breeders do this and it can be done automatically when the package is input into FedEx. Anytime I've order from Adam at 8Ball for instance I get an automatic notification of the tracking number so I can watch it myself as it travels along.