Welcome to Lost Photos
Enter your e-mail log-in info and hit Find My Photos. It's really that simple.
Download in progress
While it searches, Lost Photos tells you how many messages it has gone through and how many photos it has downloaded.
Access your photos
You can always open up Lost Photos to access the photos it has already downloaded. Also, you can choose to show items in Explorer (Windows) or Finder (Mac).
While it does have the option to ignore messages received before a certain date, more search options would have been nice.