Agree with Tim about a neck staple typically being a keeper for a strap which wrapped around the neck. Many originals show evidence (discoloration) where a strap encircled the neck, and went through the staple to hold it in place. Although I’m sure there were some attached directly to the staple by the new owner if purchased without a strap - (or done that way later, when a strap was replaced), it was not likely the builder’s original intent.