Amazon S3 PutObject() return value to confirm success?

Approximately once\week a file upload fails when saving to Amazon S3 (1\300). The following code works well enough to confirm that the file saved correctly, but I can't help but think there's a better way. When a file does fail, no exception is thrown so I'm never really certain where the problem lies. Any suggestions for better confirmation?

AmazonS3Config _s3Config = new AmazonS3Config
{
    ServiceURL = "s3.amazonaws.com",
    CommunicationProtocol = Protocol.HTTPS,
};

using (AmazonS3 client = AWSClientFactory.CreateAmazonS3Client("accessKey", "secretAccessKey", _s3Config))
{
    PutObjectRequest request = new PutObjectRequest();

    request.WithBucketName("bucketName")
           .WithFilePath("filePath")
           .WithKey("keyName");

    request.WithServerSideEncryptionMethod(ServerSideEncryptionMethod.AES256);

    PutObjectResponse response = client.PutObject(request);

   // what property from the response object can I check to confirm success???
}

// the following DoesObjectExist() function uses the GetObjectMetadata() function
if (!DoesObjectExist(keyName))
    throw new Exception("Failed!");