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Yes block the nest boxes unless you enjoy cleaning them.

Here's a link to the light. They have them on sale pretty much all the time except now of course. https://www.harborfreight.com/36-led-solar-security-light-60498.htm

Get a light of some sort in the coop and they should start going in on their own. Even a cheap battery powered lantern or solar powered light from would work. Harbor Freight has a cheap little solar light that would be perfect. Turn it off after they go in. I had to show mine a couple of times...