Blue LEGO City Police Station set

I lost my son's blue LEGO City Police Station set yesterday around 3pm. It's a mid-sized brick-built set, mostly blue and gray, about the size of a shoebox. Comes with two minifigs: a police officer with a black cap and a burglar with a striped shirt. It was in a blue backpack near the Buchanan Galleries entrance on Buchanan Street, Glasgow, when two small blue 1x1 round studs and a few gray bricks popped loose; a red roof tile is slightly bent. The set is sentimental; it's his favorite and he saved up pocket money for it. If anyone finds it, I’d be grateful to get it back.