The purpose of the cover is to keep the moisture in because your water in the bottom reservoir needs to be saved for the potting mix to wick up into the plant. Without the cover of plastic you will have dry soil from the sun and wind which would be detrimental to the plants.
When I used my Earth Boxes and needed a new cap I used the plastic that I saved from the peat moss and other mixes I bought for around the garden. They work well, just tuck them down inside the container and put the holes in them with a sharp knife to plant through.
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In the spring at the end of the day you should smell like dirt
~Margaret Atwood~
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