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S3 Natively does not have any conditions that would satisfy this for the PutObject but what you could consider is making a HeadObject request first and if the object does not exist (404 - requires the writer to have s3:ListBucket permission) then continue with the PutObject.
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Set an object lock https://docs.aws.amazon.com/AmazonS3/latest/userguide/object-lock.html
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This is a check-then-act race condition.