Your detailed sales statistics has information such as the dates your images were sold, Image Titles and Image ID numbers. To see the thumbnails of images sold, log in to the main site here.
Once you are logged in, go to your dashboard by clicking on your name, then click on the link Images Pending/Online. Enter the Id. of an image sold in the ID field, change the default list from Disabled to Enabled images using the dropdown next to the Go button, then click on the Go button. The image of the Id. number that you entered will appear on screen.