Pictured below is the only non-dug Schenkl conversion shell that I know of. It was found at Gettysburg in Hoffman's barn on the East Cavalry Field. It has never been handled by a dealer. That's important with such a rare piece because a lot of creative work has been done in years past to raise the value of artifacts. It appears likely that the Richmond Arsenal covered many or all of their wood sabots with readily available tin cans for 3 inch cannisters. They probably learned about wood expansion the hard way. About 30 years ago, Gary Wilkinson offered Dan Hoffman what was then a king's ransome for this beauty, but I don't think he ever got it.