I'm really starting to think LE did a drive by the second time. Maybe I'm wrong, but it would explain why no other neighbors heard knocking or barking and why the names of those officers has not been released.
If there were frequent complaints (nuisance) and they'd been there once before, I can imagine a patrol car slowly cruising the alley, listening, hearing nothing and moving on. Maybe if they get a noise complaint and when they get there, there's no noise , they can't do anything.
I dunno. Maybe they knocked. But I think someone would have heard them.
There would be one downstairs apartment on KS's side of the duplex and maybe one on the other side of the duplex.
I think the dogs are important.