Very nice rifle, agreed. But that's not a Delaware river rifle. The first rifle you pictured is the classic form - the long, sloping neck in symmetrical fashion and topped by the daisy. Also, the entire box itself tends to be symmetrical, unlike Lancaster area boxes. Both sideplates along the box lid will tend to be symmetrical as well as the entire finial. I think I recall at least one unsigned William Antes (attributed) with a box along these lines as well.