Lost framed diploma/Dun Laoghaire Dart Station/Southbound platform/August 1st, 15.30

lost cream colour/purple flowers/ shopping bag containing framed TCD diploma, one pair of jeans (man), one black trousers (lady). I left this bag by mistake on a window sill beside a shelter on the South platform of Dun Laoghaire Dart Station at approximately 15.30. I realised this when I got to Dalkey, and I returned within 30 minutes, but the bag was gone. I checked with the stationmaster in the ticket office, and he rang Bray, but no sign of my bag.