title: Is it possible to retrieve messages from SQS while they're invisible?
body: <p>Is it possible to retrieve messages from an SQS queue during their visibility timeout if you don't have the message id? I.e. something along the lines of "get invisible messages" or "get messages currently being processed".</p>
  
  <p>I'm working with large timeouts and sometimes I'd like to be able to inspect the queue to see what's left. I'd rather not have to wait for a 5 hour timeout to expire.</p>
  
  <p>I'm working with boto in python.</p>
  
  <p>Thanks.</p>