Alstrong said:Tools->internet options
Temporary internet files -> settings -> View Files
Arrange by type and look for jpgs. If you can't tell which one is which, drag select all the jpgs and copy to another folder. You said they were large images, so you can try sorting by size. Otherwise, if you have an image viewer handy like ACDSee, you can easily find them just by going through the JPGs.
You're doing god's work here...