code: func (s SandboxService) Put(id string) (box Sandbox, err error) {
  	answer := make(map[string]bool)
  	answer["is_completed"] = true
  	body, err := JSONReader(answer)
  
  	if id == "" {
  		return box, fmt.Errorf("must supply sandbox id to PUT request.")
  	}
  
  	err = s.client.magicRequestDecoder("PUT", "/sandboxes/"+id, body, &box)
  	return
  }
docs: // Put is used to commit a sandbox ID to the chef server. To singal that the sandox you have Posted is now uploaded.