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Inspired by Larry's results, I moved my outside in-ground (covered) mixing tray inside (uncovered) to a shelf in my garage. I've been adding worms a little at a time as I remove castings from my various bins, so it's no where near even 1/2 capacity yet, but the worms have not demonstrated any desire to "roam" yet. I don't leave a light on and there is no light of any kind in my garage unless the garage door is open.
I've been feeding rabbit manure covered by shredded newspaper and some torn scraps of corrugated cardboard. Since the bin is uncovered,it remains relatively dry compared to a covered bin. I use a pump sprayer to keep the bedding moist.
I see more of these open bins in my future. These are the bigger version of these type of trays, so you wouldn't want to be moving these trays around a lot when they are full, but it wouldn't surprise me if they can hold near 10 lbs of worms if conditions are right. I think they are nearly the perfect holding bin for me.