Hi Greg......welcome to TFF!
Tell your boss to hang onto this shotgun. The potential value ranges from about $750 up to about $7,700......depending on grade and condition.
"Uncle Dan" Lefever was the founder of Lefever Arms and he designed and manufactured the first breech loading double hammmerless shotgun made in the U.S. in 1872. Later he sold his interest in the company, moved to Ohio and started aother factory under the name of D.M. Lefever & Son.
The total production on D.M. Lefever & Son shotguns between 1901-1904 was less than 1,200.
In order to value this shotgun, we need to know it's condition (approximate % of original finish left) and it's grade (hopefully marked somewhere on the gun).
If it's pretty plain (0 Excelsior Grade), we need to know whether or not it has ejectors.
If it's engraved, there should be some markings, from "AA Grade, No.4" thru "F Grade, No.9" somewhere on the gun.....
Let us know what you find......