Little bit late to this thread, but I use plastic dish pans for my nest boxes and it has been working out great for me.
Here is a picture of three plastic dish bins sitting on a wooden rail system inside the coop. I added anti-tip bars underneath the bins so the hens won't tip over the bin when coming in/going out.
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There are many advantages to this system, but first and foremost is the ease of cleaning any bin if required. These bins are not attached to the rail system, so if you need to clean a bin, you simply pull it off. If you need to replace a bin, you just drop another one on the rail. If you have a broody hen and you need to isolate her and the eggs, you can simply pick her up with the bin and eggs all together and move them together.
Here is a picture of how I harvest my eggs from the outside of the coop.
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I have a simple hinged drop down access panel that I lower and reach in for the eggs. Again, there are advantages to this system in that I can remove/replace any bin or bins from either the outside or the inside of the coop.
Here in the US, we can get these plastic dish bins at our local Dollar Store for only $1.00. I use these handy bins for lots of projects around the house because they last forever, but cheap if for some reason you have to replace them. Someone said their plastic bins crack in the cold weather, but my plastic dish pan nest box bins have not cracked at all this winter with temps down to -22F (-30C).
At any rate, these plastic dish bins have worked just great for me and I would highly recommend them to anyone considering their options.