It seems like it might be helpful to compile answers to statements and questions being repeated since this thread is going rapid fire again:
In that neighborhood, garbage is picked up once a week (on Fridays) Recycle is picked up every other week.
The police performed a search of the area around where the first set of remains were discovered immediately following the discovery. While they had dogs, we are not sure if they were actually HRD (cadaver) dogs or another type of search dog. They WOULD NOT have been able to enter onto private property during this search without a warrant, therefore, the only bins and areas searched would have been those still out on the sidewalk, IE public property, or those searched by homeowners themselves after hearing of the discovery/ being notified by police.
A lot of people are wondering why the homeowner where the second remains were discovered did not notice them in their bin. They could have: A) been out of town B) JC could have entered their property (as in, walked a few feet up their diveway, lawn, etc.) and placed the remains in the bin where it normally sat, making it less likely that someone would notice if had things in it or not. The type of bags JC used are utterly common and generic, and the likelihood of said homeowner using the same ones is pretty high (this would draw less suspicion about bags in their bin) Also, if you live in a household with more than one person, it would not be unreasonable to assume someone else from the house had simply put regular trash in the bin if it was even noticed.
Sanitation workers in the area were notified to watch out for remains in that at surrounding areas. We do have the trucks with the big fork like grabbing thing that grabs cans and throws them in, but often the worker has to at least line the bin up with the forks, and since there are many cars parked on the sides of the street, they would most certainly had to have brought them to the truck. (And again, they were notified to keep a close watch out, in that area especially)
I am not entirely sure why this part matters to so many folks, but we have three bins available in seattle: Usually the largest is the blue recycling bin, as the ones supplied are all the same size, since not only is recycling free around here, but they subsidize your garbage bill with the worth of the recycling. Next are the bins for actual garbage, which you pay for by the size, so size varies, but they are almost always black. Then we have green or brown bins for yard, food, and compostable waste.