Delivery by drone is a fairly new idea, (but maybe not as new as you think). To the consumer, it represents the ultimate in convenience; to the company, it means eliminating all those drivers with their pesky demands for "pay" and "benefits". But -- if you're a bit shady -- it's basically a flying piņata. Trust me, if drone delivery really takes off, so will drone piracy.
So, how will the 21st century scallywags get the goods?
Method 1 (high tech): Hack the drone, re-routing it to a safe area, then take the package and maybe even strip the drone itself. Clear out quickly, it's likely being tracked in realtime by GPS.
Method 2 (low tech): Bird gun.
Can you tell I'm on a bit of a Cyberpunk kick? 
Ron
P.S. The linked clip is from Cowboy Bebop (1998).