Lost Bag with Car Keys in Taxi

Black Betty Barclay bag left in Taxi Saturday24th October 2015 into Sunday 25 October 2015 either on pick up from outside Parnells GAA club - Hillbilly Chicken, Fairview or return trip to Kilmore West Dublin 5. Car keys in bag which are very important. Keys also hold a blue halldoor key and a purple Tinkerbell key. Nil else of value in bag. I would be extremely grateful to get the keys back. Reward.