This just seems like a silly hoax... Carrier pigeons don't go to arbitrary destinations, they're capable of going to 2 places that they've already been familiarized with, maximum.
"Connection oriented service is available in some cities, usually based upon a central hub topology."[0]
Side-note: When i looked up what sound pigeons make, i was pleasantly surprised to learn that there exists a Pigeonpedia! :-)
So, yeah, train the pigeons well enough and they can set up delivery routes.