Well known methods of shipping drugs are to either pick an address on a route for the delivery company driver to take it or ship to a house where the owner won't be home during the day so someone can pick it up off the front porch. I don't think that merely being the addressee of a package of drugs should be sufficient to allow a no knock raid.
They had intercepted the package, and new it had drugs. Then the police delivered it to his door. When his wife noticed the package and took it inside, they snuck up on the house, guns drawn, to invade. The grandmother saw them and screamed, and they took that as a “warning” and so they broke in the doors. The dogs barked and they shot the dogs, pinned the grandmother down in the kitchen, harassed the family for a while.
They never bothered to check the address to figure out it was the Mayor.