Don't throw away your old buckets! I will take them off you hands and keep them out of our landfill.
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You could attach hw cloth to the inside of the coop where the vent is with nuts and bolts. Then, it would be secure enough. But, maybe you have already done that?I'm not sure about raccoon proof, since that is fully inside the coop, but you could probably make them lock somehow to make them even safer if raccoons have access. My coop is a 10x10 chainlink dog lot covered in hardwire mesh, inside my backyard with large dogs acting as chicken security. They do work really well for summer/winter though, since I can open/close them as needed for airflow and they never are 100% closed up so moisture can still vent out.
You could attach hw cloth to the inside of the coop where the vent is with nuts and bolts. Then, it would be secure enough. But, maybe you have already done that?