Restore old, scratched, dented objects in photographs

Photo editing request (example): "This little 'Johnson's Gift (tin) Box' has been in the family since the early 1960s. It has now attained the status of a family heirloom — well nearly! Regretably it wasn't much looked after and shows a lot of wear and tear. Please touch up the box in the photo, so we might get a feel of what it looked like before the years of battering took their toll on it..."