Lost iphone 4 in a black case in Belmayne or Malahide Castle

I lost my iphone 4 either outside Belmayne Educated Together School or in Malahide Castle in or around the playground
on the 13th of September 2016. It is in a black Otterbox case, is white and on the inside.It has photos of sentimental value
on it. Would be so delighted to get it back. Reward Offered.