Which operating system are you using?
Probably the Recovery Images that photoshop cs6 saved when photoshop cs6 crashed.
Look for the images in the following places and then you can delete them
C:\Users\[Your username]\AppData\Roaming\Adobe\Adobe Photoshop CS6\AutoRecover
~/Library/Application Support/Adobe/Adobe Photoshop CS6/AutoRecover
You should also be able to right click on one of the image tabs and select either Reveal in Explorer or Reveal in Finder