How to receive more than 10 amazon SQS message programmatically

We have SQS Standard Message Queue and its growing very fast. most of time we receiving old notification. We have configure Message Retention Period for 2 days. Is there any way to receive more than 10 messages programmatically. Following is my code to revive SQS Messages from amazon.

private IEnumerable<Message> getMessagesFromQ(string accessKeyId, string secretAccessKey, string myQueueURL)
    {
        using (var amazonSQSClient = new AmazonSQSClient(accessKeyId, secretAccessKey, Amazon.RegionEndpoint.USWest2))
        {

            ReceiveMessageRequest recieveMessageRequest =
                new ReceiveMessageRequest();

            recieveMessageRequest.QueueUrl = myQueueURL;
            recieveMessageRequest.MaxNumberOfMessages = 10;

            ReceiveMessageResponse receiveMessageResponse =
                amazonSQSClient.ReceiveMessage(recieveMessageRequest);

            return receiveMessageResponse.Messages;
        }
    }