Ballyshannon House Datestone

Browsing through Ger McCarthy's "The Forgotten Heritage of Kildare", as one is wont to do, I came across reference to the datestone that used to be in Ballyshannon House and the carved date of 1620. Ger thinks that the stone is lost. I think that stone was in the Heritage Centre in Kildare. A number of stones were brought there when it was done up in the 80's. I'm not sure about that, does anyone know? I will check when the Heritage Centre reopens after the Christmas.